13‑Dec‑1971 | Kingston | Hard | QF | | | Milan Holecek [CZE] d. Froehling | 6-3 6-4 | | | | | | | | | |
1‑Dec‑1971 | Buenos Aires | Clay | QF | | | Zeljko Franulovic [CRO] d. Froehling | 6-7 7-6 7-6 6-4 | | | | | | | | | |
1‑Dec‑1971 | Buenos Aires | Clay | R16 | | | Froehling d. Jaime Pinto Bravo [CHI] | 7-6 7-5 7-5 | | | | | | | | | |
1‑Dec‑1971 | Buenos Aires | Clay | R32 | | | Froehling d. Lito Alvarez [ARG] | 7-6 6-4 6-2 | | | | | | | | | |
1‑Nov‑1971 | Wembley | Hard | R32 | | | John Alexander [AUS] d. Froehling | 7-5 6-2 | | | | | | | | | |
8‑Oct‑1971 | Davis Cup WG CR: USA vs ROU | Clay | RR | | | Froehling d. Ion Tiriac [ROU] | 3-6 1-6 6-1 6-3 8-6 | | | | | | | | | |
8‑Oct‑1971 | Davis Cup WG CR: USA vs ROU | Clay | RR | | | Ilie Nastase [ROU] d. Froehling | 6-3 6-1 1-6 6-4 | | | | | | | | | |
20‑Sep‑1971 | Sacramento | Hard | QF | | | Alejandro Olmedo [PER] d. Froehling | 6-4 3-6 7-5 | | | | | | | | | |
20‑Sep‑1971 | Los Angeles | Hard | R16 | | | Bob Carmichael [AUS] d. (6)Froehling | 6-3 6-0 | | | | | | | | | |
20‑Sep‑1971 | Sacramento | Hard | R16 | | | Froehling d. Ove Nils Bengtson [SWE] | 6-2 7-5 | | | | | | | | | |
20‑Sep‑1971 | Los Angeles | Hard | R32 | | | (6)Froehling d. Tom Edlefsen [USA] | 7-6 6-4 | | | | | | | | | |
20‑Sep‑1971 | Sacramento | Hard | R32 | | | Froehling d. Ray Keldie [AUS] | 6-7 6-1 6-3 | | | | | | | | | |
20‑Sep‑1971 | Los Angeles | Hard | R64 | | | (6)Froehling d. Ray Keldie [AUS] | 7-5 7-5 | | | | | | | | | |
20‑Sep‑1971 | Sacramento | Hard | R64 | | | Froehling d. Patrick Proisy [FRA] | 6-2 6-2 | | | | | | | | | |
1‑Sep‑1971 | US Open | Grass | QF | | | Jan Kodes [CZE] d. Froehling | 6-0 7-6 6-3 | | | | | | | | | |
1‑Sep‑1971 | US Open | Grass | R16 | | | Froehling d. Bob Carmichael [AUS] | 7-6 6-4 6-4 | | | | | | | | | |
1‑Sep‑1971 | South Orange | Hard | R16 | | | Clark Graebner [USA] d. Froehling | 6-2 7-5 | | | | | | | | | |
1‑Sep‑1971 | US Open | Grass | R32 | | | Froehling d. Roscoe Tanner [USA] | 7-6 5-7 6-3 7-6 | | | | | | | | | |
1‑Sep‑1971 | South Orange | Hard | R32 | | | Froehling d. Herb Fitzgibbon [USA] | 7-6 7-5 | | | | | | | | | |
1‑Sep‑1971 | US Open | Grass | R64 | | | Froehling d. Andrew Pattison [USA] | 7-5 4-6 6-7 6-3 6-4 | | | | | | | | | |
1‑Sep‑1971 | South Orange | Hard | R64 | | | Froehling d. Mike Kreiss [USA] | 7-6 6-0 | | | | | | | | | |
1‑Sep‑1971 | US Open | Grass | R128 | | | Froehling d. Jurgen Fassbender [GER] | 6-3 6-3 6-3 | | | | | | | | | |
22‑Aug‑1971 | Merion | Hard | SF | | | (2)Clark Graebner [USA] d. (4)Froehling | 6-7 6-7 7-6 7-6 6-3 | | | | | | | | | |
22‑Aug‑1971 | Merion | Hard | QF | | | (4)Froehling d. (5)Jan Leschly [DEN] | 7-6 6-2 | | | | | | | | | |
22‑Aug‑1971 | Merion | Hard | R16 | | | (4)Froehling d. Georges Goven [FRA] | 7-5 1-6 7-6 | | | | | | | | | |
22‑Aug‑1971 | Merion | Hard | R32 | | | (4)Froehling d. Geoff Masters [AUS] | 6-3 6-3 | | | | | | | | | |
22‑Aug‑1971 | Merion | Hard | R64 | | | (4)Froehling d. Fred Mcnair [USA] | 6-1 4-6 6-3 | | | | | | | | | |
9‑Aug‑1971 | Indianapolis | Clay | R16 | | | Patricio Cornejo [CHI] d. Froehling | 6-4 7-6 | | | | | | | | | |
9‑Aug‑1971 | Indianapolis | Clay | R32 | | | Froehling d. Joaquin Loyo Mayo [MEX] | 4-6 7-6 7-5 | | | | | | | | | |
9‑Aug‑1971 | Indianapolis | Clay | R64 | | | Froehling d. Bill Lloyd [AUS] | 6-1 6-1 | | | | | | | | | |
2‑Aug‑1971 | Cincinnati | Clay | R16 | | | Erik Van Dillen [USA] d. (7)Froehling | 6-2 6-4 | | | | | | | | | |
2‑Aug‑1971 | Cincinnati | Clay | R32 | | | (7)Froehling d. Sandy Mayer [USA] | 4-6 6-1 6-2 | | | | | | | | | |
2‑Aug‑1971 | Cincinnati | Clay | R64 | | | (7)Froehling d. Geoff Masters [AUS] | 6-3 6-4 | | | | | | | | | |
24‑Jul‑1971 | Tanglewood | Hard | R16 | | | Jimmy Connors [USA] d. Froehling | 6-1 4-6 6-1 | | | | | | | | | |
24‑Jul‑1971 | Tanglewood | Hard | R32 | | | Froehling d. Terry Addison [AUS] | 6-3 3-6 6-3 | | | | | | | | | |
24‑Jul‑1971 | Tanglewood | Hard | R64 | | | Froehling d. Mike Estep [USA] | 6-3 6-4 | | | | | | | | | |
17‑Jul‑1971 | Washington WTC | Clay | R16 | | | Marty Riessen [USA] d. Froehling | 7-5 6-1 | | | | | | | | | |
17‑Jul‑1971 | Washington WTC | Clay | R32 | | | Froehling d. Owen Davidson [AUS] | 6-1 6-0 | | | | | | | | | |
17‑Jul‑1971 | Washington WTC | Clay | R64 | | | Froehling d. Bob Carmichael [AUS] | 7-5 3-6 7-5 | | | | | | | | | |
21‑Jun‑1971 | Wimbledon | Grass | R128 | | | Robert Lutz [USA] d. Froehling | 8-6 8-9 4-6 6-2 12-10 | | | | | | | | | |
14‑Jun‑1971 | Eastbourne | Grass | R64 | | | Robert Maud [RSA] d. Froehling | W/O | | | | | | | | | |
14‑Jun‑1971 | London / Queen's Club | Grass | R64 | | | Ross Case [AUS] d. Froehling | 3-6 6-3 6-4 | | | | | | | | | |
22‑May‑1971 | Bournemouth | Clay | R16 | | | Robert Maud [RSA] d. Froehling | 3-6 9-8 4-6 6-3 6-3 | | | | | | | | | |
22‑May‑1971 | Bournemouth | Clay | R32 | | | Froehling d. John Paish [GBR] | 1-6 6-3 4-6 6-4 6-2 | | | | | | | | | |
21‑May‑1971 | Roland Garros | Clay | SF | | | (3)Ilie Nastase [ROU] d. Froehling | 6-0 2-6 6-4 6-3 | (ch) | | | | | | | | |
21‑May‑1971 | Roland Garros | Clay | QF | | | Froehling d. (2)Arthur Ashe [USA] | 6-4 4-6 6-3 3-6 8-6 | | | | | | | | | |
21‑May‑1971 | Roland Garros | Clay | R16 | | | Froehling d. (7)Marty Riessen [USA] | 1-6 2-6 6-3 6-4 6-2 | | | | | | | | | |
21‑May‑1971 | Roland Garros | Clay | R32 | | | Froehling d. Jan Leschly [DEN] | 4-6 6-3 8-6 7-5 | | | | | | | | | |
21‑May‑1971 | Roland Garros | Clay | R64 | | | Froehling d. John Cooper [AUS] | 6-2 6-2 6-3 | | | | | | | | | |
21‑May‑1971 | Roland Garros | Clay | R128 | | | Froehling d. (Q)Rainer Kuhlmey [GER] | 6-4 6-3 6-3 | | | | | | | | | |
17‑May‑1971 | Hamburg | Clay | R64 | | | Ingo Buding [GER] d. Froehling | W/O | | | | | | | | | |
3‑May‑1971 | Madrid | Clay | R16 | | | Jose Edison Mandarino [BRA] d. Froehling | 6-2 7-9 6-1 | | | | | | | | | |
3‑May‑1971 | Madrid | Clay | R32 | | | Froehling d. Jose Higueras [ESP] | 6-1 6-2 | | | | | | | | | |
30‑Apr‑1971 | Kansas City | Hard | QF | | | Cliff Richey [USA] d. Froehling | 6-4 6-2 | | | | | | | | | |
20‑Apr‑1971 | Houston | Clay | QF | | | Clark Graebner [USA] d. Froehling | 6-2 7-6 | | | | | | | | | |
20‑Apr‑1971 | Houston | Clay | R16 | | | Froehling d. Martin Mulligan [AUS] | 2-6 7-6 7-6 | | | | | | | | | |
20‑Apr‑1971 | Houston | Clay | R32 | | | Froehling d. Graham Stilwell [GBR] | 6-4 6-4 | | | | | | | | | |
18‑Apr‑1971 | Charlotte | Hard | R16 | | | Stan Smith [USA] d. Froehling | 7-6 6-1 | | | | | | | | | |
18‑Apr‑1971 | Charlotte | Hard | R32 | | | Froehling d. Martin Mulligan [AUS] | 6-3 7-5 | | | | | | | | | |
7‑Apr‑1971 | Des Moines | Carpet | R16 | | | Onny Parun [NZL] d. Froehling | 6-4 6-4 | | | | | | | | | |
28‑Mar‑1971 | San Juan | Hard | QF | | | Tom Gorman [USA] d. Froehling | 6-4 6-3 | | | | | | | | | |
28‑Mar‑1971 | San Juan | Hard | R16 | | | Froehling d. Zeljko Franulovic [CRO] | 6-3 0-6 6-2 | | | | | | | | | |
28‑Mar‑1971 | San Juan | Hard | R32 | | | Froehling d. Tom Edlefsen [USA] | 7-6 6-1 | | | | | | | | | |
24‑Mar‑1971 | Pensacola | Hard | QF | | | Nicola Spear [SRB] d. Froehling | 6-2 3-6 7-6 | | | | | | | | | |
24‑Mar‑1971 | Pensacola | Hard | R16 | | | Froehling d. Richard Russell [JAM] | 7-6 6-2 | | | | | | | | | |
24‑Mar‑1971 | Pensacola | Hard | R32 | | | Froehling d. Tony Parun [NZL] | 6-3 6-2 | | | | | | | | | |
21‑Mar‑1971 | Caracas | Clay | QF | | | Manuel Orantes [ESP] d. Froehling | 7-5 5-7 7-6 | | | | | | | | | |
21‑Mar‑1971 | Caracas | Clay | R16 | | | Froehling d. Peter Curtis [GBR] | 6-4 6-1 | | | | | | | | | |
21‑Mar‑1971 | Caracas | Clay | R32 | | | Froehling d. Vladimir Zednik [CZE] | 7-6 6-4 | | | | | | | | | |
7‑Mar‑1971 | Hampton | Hard | QF | | | Ilie Nastase [ROU] d. Froehling | 6-4 6-1 | | | | | | | | | |
7‑Mar‑1971 | Hampton | Hard | R16 | | | Froehling d. Tom Gorman [USA] | 6-1 6-4 | | | | | | | | | |
7‑Mar‑1971 | Hampton | Hard | R32 | | | Froehling d. Peter Curtis [GBR] | 4-6 6-0 7-6 | | | | | | | | | |
1‑Mar‑1971 | Macon | Hard | R32 | | | Ilie Nastase [ROU] d. Froehling | 6-4 7-5 | | | | | | | | | |
21‑Feb‑1971 | Salisbury | Hard | R64 | | | Jaime Fillol [CHI] d. Froehling | 6-7 7-6 6-2 | | | | | | | | | |
14‑Feb‑1971 | New York | | R32 | | | Juan Gisbert [ESP] d. Froehling | 7-5 6-2 | | | | | | | | | |
27‑Jan‑1971 | Omaha | Carpet | QF | | | Cliff Richey [USA] d. Froehling | 6-4 6-2 | | | | | | | | | |
27‑Jan‑1971 | Omaha | Carpet | R16 | | | Froehling d. Ion Tiriac [ROU] | 6-1 6-2 | | | | | | | | | |