1‑Sep‑1968 | Bucharest | | SF | | | Peter Marmureanu [ROU] d. Tiriac | W/O | | | | | | | | | |
1‑Sep‑1968 | Bucharest | | QF | | | Tiriac d. Constantin Nastase [ROU] | 6-2 6-0 6-1 | | | | | | | | | |
19‑Aug‑1968 | Ortisei | Clay | F | | | Tiriac d. Nicola Pietrangeli [ITA] | 3-6 6-2 6-0 6-2 | | | | | | | | | |
19‑Aug‑1968 | Ortisei | Clay | SF | | | Tiriac d. Martin Mulligan [AUS] | 6-3 6-3 | | | | | | | | | |
19‑Aug‑1968 | Ortisei | Clay | QF | | | Tiriac d. Tom Edlefsen [USA] | 6-1 6-1 | | | | | | | | | |
19‑Aug‑1968 | Ortisei | Clay | R16 | | | Tiriac d. Massimo Di Domenico [ITA] | 6-1 6-1 | | | | | | | | | |
12‑Aug‑1968 | Viareggio | Clay | QF | | | Eugenio Castigliano [ITA] d. Tiriac | 6-2 6-3 | | | | | | | | | |
11‑Aug‑1968 | Senigallia | | F | | | Martin Mulligan [AUS] d. Tiriac | 6-4 6-3 6-2 | | | | | | | | | |
11‑Aug‑1968 | Senigallia | | SF | | | Tiriac d. Boro Jovanovic [CRO] | 6-4 2-6 6-4 | | | | | | | | | |
11‑Aug‑1968 | Senigallia | | QF | | | Tiriac d. Thomaz Koch [BRA] | 6-8 6-3 6-4 | | | | | | | | | |
11‑Aug‑1968 | Senigallia | | R16 | | | Tiriac d. Vittorio Crotta [ITA] | 6-2 6-2 | | | | | | | | | |
31‑Jul‑1968 | Munich | Clay | F | | | Martin Mulligan [AUS] d. Tiriac | 6-3 3-6 7-5 6-3 | | | | | | | | | |
31‑Jul‑1968 | Munich | Clay | SF | | | Tiriac d. Mark Cox [GBR] | 6-3 6-4 6-3 | | | | | | | | | |
31‑Jul‑1968 | Munich | Clay | QF | | | Tiriac d. Milan Holecek [CZE] | 3-6 7-5 6-3 2-6 7-5 | | | | | | | | | |
31‑Jul‑1968 | Munich | Clay | R16 | | | Tiriac d. Petr Strobl [CZE] | 6-1 6-1 | | | | | | | | | |
31‑Jul‑1968 | Munich | Clay | R32 | | | Tiriac d. DUPE Rohan Summers [RSA] | 6-1 6-2 | | | | | | | | | |
31‑Jul‑1968 | Munich | Clay | R64 | | | Tiriac d. Gunther Prell [GER] | 6-2 6-1 | | | | | | | | | |
22‑Jul‑1968 | Hilversum | Clay | QF | | | Robert Maud [RSA] d. Tiriac | 6-2 9-7 | | | | | | | | | |
22‑Jul‑1968 | Hilversum | Clay | R16 | | | Tiriac d. Peter Pokorny [AUT] | 9-7 6-2 | | | | | | | | | |
22‑Jul‑1968 | Hilversum | Clay | R32 | | | Tiriac d. Siebe Huizinga [NED] | 6-4 6-0 | | | | | | | | | |
8‑Jul‑1968 | Bastad 1 | Clay | F | | | Martin Mulligan [AUS] d. Tiriac | 8-6 6-4 6-4 | | | | | | | | | |
8‑Jul‑1968 | Bastad 1 | Clay | SF | | | Tiriac d. Manuel Santana [ESP] | 6-3 5-7 2-6 7-5 6-3 | | | | | | | | | |
8‑Jul‑1968 | Bastad 1 | Clay | QF | | | Tiriac d. Jose Luis Arilla [ESP] | 6-4 6-4 6-1 | | | | | | | | | |
8‑Jul‑1968 | Bastad 1 | Clay | R16 | | | Tiriac d. Thomaz Koch [BRA] | 6-4 4-6 6-2 6-1 | | | | | | | | | |
8‑Jul‑1968 | Bastad 1 | Clay | R32 | | | Tiriac d. Christer Holm [UNK] | 8-6 6-2 6-0 | | | | | | | | | |
24‑Jun‑1968 | Wimbledon | Grass | R64 | | | (5)Roy Emerson [AUS] d. Tiriac | 5-7 6-1 6-2 6-0 | | | | | | | | | |
24‑Jun‑1968 | Wimbledon | Grass | R128 | | | Tiriac d. Richard Russell [JAM] | 7-5 6-2 8-6 | | | | | | | | | |
10‑Jun‑1968 | Lugano | Clay | F | | | Tiriac d. Tom Okker [NED] | 6-8 7-5 6-0 | | | | | | | | | |
10‑Jun‑1968 | Lugano | Clay | SF | | | Tiriac d. Jaidip Mukerjea [IND] | 6-0 6-2 | | | | | | | | | |
10‑Jun‑1968 | Lugano | Clay | QF | | | Tiriac d. Ken Fletcher [AUS] | 8-6 3-6 7-5 | | | | | | | | | |
10‑Jun‑1968 | Lugano | Clay | R16 | | | Tiriac d. Nicola Spear [SRB] | 6-0 6-1 | | | | | | | | | |
10‑Jun‑1968 | Lugano | Clay | R32 | | | Tiriac d. Piero Toci [ITA] | 6-1 6-1 | | | | | | | | | |
27‑May‑1968 | Roland Garros | Clay | QF | | | (1)Rod Laver [AUS] d. (9)Tiriac | 4-6 4-6 6-3 6-3 6-0 | | | | | | | | | |
27‑May‑1968 | Roland Garros | Clay | R16 | | | (9)Tiriac d. Zeljko Franulovic [CRO] | 6-4 6-3 6-2 | | | | | | | | | |
27‑May‑1968 | Roland Garros | Clay | R32 | | | (9)Tiriac d. Milan Holecek [CZE] | 3-6 8-6 7-5 6-2 | | | | | | | | | |
27‑May‑1968 | Roland Garros | Clay | R64 | | | (9)Tiriac d. Jean Loup Rouyer [FRA] | 6-1 6-2 6-1 | | | | | | | | | |
27‑May‑1968 | Roland Garros | Clay | R128 | | | (9)Tiriac d. Georges Deniau [FRA] | 6-1 6-1 6-1 | | | | | | | | | |
24‑May‑1968 | Davis Cup EUR QF: NOR vs ROU | Clay | RR | | | Tiriac d. Nils Elvik [NOR] | 6-2 6-2 6-4 | | | | | | | | | |
24‑May‑1968 | Davis Cup EUR QF: NOR vs ROU | Clay | RR | | | Tiriac d. Frithjof Prydz [NOR] | 6-1 6-4 6-2 | | | | | | | | | |
6‑May‑1968 | Rome | Clay | QF | | | (15)Alex Metreveli [RUS] d. (7)Tiriac | 4-6 4-6 6-1 8-6 7-5 | | | | | | | | | |
6‑May‑1968 | Rome | Clay | R16 | | | (7)Tiriac d. (10)Ray Ruffels [AUS] | 6-1 6-3 6-4 | | | | | | | | | |
6‑May‑1968 | Rome | Clay | R32 | | | (7)Tiriac d. Dick Crealy [AUS] | 4-6 6-3 6-1 6-2 | | | | | | | | | |
6‑May‑1968 | Rome | Clay | R64 | | | (7)Tiriac d. Frew Mcmillan [RSA] | 6-2 6-3 6-1 | | | | | | | | | |
29‑Apr‑1968 | Reggio Calabria | Clay | SF | | | Marty Riessen [USA] d. Tiriac | 6-0 6-2 | | | | | | | | | |
29‑Apr‑1968 | Reggio Calabria | Clay | QF | | | Tiriac d. Alan Fox [USA] | 6-3 6-4 | | | | | | | | | |
29‑Apr‑1968 | Reggio Calabria | Clay | R16 | | | Tiriac d. Harald Elschenbroich [GER] | 6-4 11-9 | | | | | | | | | |
29‑Apr‑1968 | Reggio Calabria | Clay | R32 | | | Tiriac d. Claudio Narbone [ITA] | W/O | | | | | | | | | |
28‑Apr‑1968 | Davis Cup EUR R1: ROU vs DEN | Clay | RR | | | Tiriac d. Jorgen Ulrich [DEN] | 6-0 2-6 6-4 9-7 | | | | | | | | | |
28‑Apr‑1968 | Davis Cup EUR R1: ROU vs DEN | Clay | RR | | | Tiriac d. Torben Ulrich [DEN] | 6-1 6-3 6-1 | | | | | | | | | |
15‑Apr‑1968 | Palermo | Clay | F | | | Tiriac d. Marty Riessen [USA] | 8-6 6-0 1-6 6-4 | | | | | | | | | |
15‑Apr‑1968 | Palermo | Clay | SF | | | Tiriac d. Dick Crealy [AUS] | 6-1 6-4 | | | | | | | | | |
15‑Apr‑1968 | Palermo | Clay | QF | | | Tiriac d. John Alexander [AUS] | 6-0 6-1 | | | | | | | | | |
15‑Apr‑1968 | Palermo | Clay | R16 | | | Tiriac d. Massimo Di Domenico [ITA] | 6-3 6-2 | | | | | | | | | |
15‑Apr‑1968 | Palermo | Clay | R32 | | | Tiriac d. Bill Tym [USA] | 6-0 6-2 | | | | | | | | | |
8‑Apr‑1968 | Catania | Clay | F | | | Martin Mulligan [AUS] d. Tiriac | 8-6 6-4 6-3 | | | | | | | | | |
8‑Apr‑1968 | Catania | Clay | SF | | | Tiriac d. Nicholas Kalogeropoulos [GRE] | 6-3 6-3 6-2 | | | | | | | | | |
8‑Apr‑1968 | Catania | Clay | QF | | | Tiriac d. Eugenio Castigliano [ITA] | 7-5 11-9 | | | | | | | | | |
8‑Apr‑1968 | Catania | Clay | R16 | | | Tiriac d. Giorgio Bologna [ITA] | 6-1 6-4 | | | | | | | | | |
8‑Apr‑1968 | Catania | Clay | R32 | | | Tiriac d. John Norgauer [USA] | 6-1 6-2 | | | | | | | | | |
25‑Mar‑1968 | Parioli | Clay | F | | | Tiriac d. Ilie Nastase [ROU] | 9-7 6-3 6-4 | | | | | | | | | |
25‑Mar‑1968 | Parioli | Clay | SF | | | Tiriac d. Gaetano Di Maso [ITA] | 6-4 6-1 6-2 | | | | | | | | | |
25‑Mar‑1968 | Parioli | Clay | QF | | | Tiriac d. Gerald Battrick [GBR] | 6-2 6-2 6-1 | | | | | | | | | |
25‑Mar‑1968 | Parioli | Clay | R16 | | | Tiriac d. Vittorio Crotta [ITA] | 6-2 6-3 6-3 | | | | | | | | | |
25‑Mar‑1968 | Parioli | Clay | R32 | | | Tiriac d. John Clifton [GBR] | 6-2 6-0 | | | | | | | | | |
25‑Mar‑1968 | Parioli | Clay | R64 | | | Tiriac d. U Lucci [ITA] | 6-0 6-1 | | | | | | | | | |
18‑Mar‑1968 | Cannes | | F | | | Tiriac d. Alex Metreveli [RUS] | 6-1 6-3 | | | | | | | | | |
18‑Mar‑1968 | Cannes | | SF | | | Tiriac d. Vyacheslav Egorov [URS] | 6-4 7-5 | | | | | | | | | |
18‑Mar‑1968 | Cannes | | QF | | | Tiriac d. Hans Jaochim Plotz [GER] | 6-3 9-7 | | | | | | | | | |
18‑Mar‑1968 | Cannes | | R16 | | | Tiriac d. Colin Dibley [AUS] | 3-6 9-7 6-1 | | | | | | | | | |
18‑Mar‑1968 | Cannes | | R32 | | | Tiriac d. Peter Pokorny [AUT] | 7-5 3-6 6-3 | | | | | | | | | |
8‑Feb‑1968 | Allahabad | | F | | | Tiriac d. Premjit Lall [IND] | 6-2 6-2 6-4 | | | | | | | | | |
29‑Jan‑1968 | New Delhi | | F | | | Premjit Lall [IND] d. Tiriac | 6-0 2-6 9-7 6-3 | | | | | | | | | |
28‑Dec‑1967 | Bombay | Clay | F | | | Alex Metreveli [RUS] d. Tiriac | 11-9 6-3 6-3 | | | | | | | | | |
28‑Dec‑1967 | Calcutta | | F | | | Tiriac d. Jaidip Mukerjea [IND] | 6-4 4-6 6-2 5-7 6-4 | | | | | | | | | |
28‑Dec‑1967 | Bombay | Clay | SF | | | Tiriac d. Premjit Lall [IND] | 6-4 6-3 | | | | | | | | | |
28‑Dec‑1967 | Calcutta | | SF | | | Tiriac d. Premjit Lall [IND] | 10-8 3-6 7-5 9-7 | | | | | | | | | |
28‑Dec‑1967 | Bombay | Clay | QF | | | Tiriac d. Shyam Minotra [IND] | 6-4 6-4 | | | | | | | | | |
28‑Dec‑1967 | Calcutta | | QF | | | Tiriac d. Zeljko Franulovic [CRO] | 6-3 6-3 4-6 8-6 | | | | | | | | | |