12‑Dec‑1983 | Sydney Outdoor | Grass | R32 | 90 | 167 | (15)Joakim Nystrom [SWE] d. Gitlin | 5-7 6-7 6-4 | | | | | | | | | |
12‑Dec‑1983 | Sydney Outdoor | Grass | R64 | 90 | 247 | Gitlin d. David Mustard [NZL] | 6-3 6-4 | | | | | | | | | |
29‑Nov‑1983 | Australian Open | Grass | R64 | 90 | 100 | Ramesh Krishnan [IND] d. Gitlin | 6-2 6-7 6-4 3-6 6-1 | | | | | | | | | |
29‑Nov‑1983 | Australian Open | Grass | R128 | 90 | 616 | Gitlin d. Tarik Benhabiles [FRA] | 4-6 6-0 7-6 6-2 | | | | | | | | | |
7‑Nov‑1983 | Taipei | Carpet | R16 | 90 | 193 | (1)Scott Davis [USA] d. Gitlin | 6-2 6-0 | | | | | | | | | |
7‑Nov‑1983 | Taipei | Carpet | R32 | 90 | 616 | Gitlin d. John Austin [USA] | 7-6 7-6 | | | | | | | | | |
31‑Oct‑1983 | Hong Kong | Hard | R16 | 90 | 24 | (3)Mark Edmondson [AUS] d. Gitlin | 7-6 6-3 | | | | | | | | | |
31‑Oct‑1983 | Hong Kong | Hard | R32 | 90 | 172 | Gitlin d. Glenn Michibata [CAN] | 6-0 6-2 | | | | | | | | | |
25‑Sep‑1983 | Maui | Hard | R32 | 90 | 127 | Morris Skip Strode [USA] d. Gitlin | 7-6 6-3 | | | | | | | | | |
12‑Sep‑1983 | Dallas | Hard | R32 | 90 | 172 | Glenn Michibata [CAN] d. Gitlin | 7-5 7-5 | | | | | | | | | |
30‑Aug‑1983 | US Open | Hard | R128 | 90 | 15 | Andres Gomez [ECU] d. Gitlin | 6-4 6-1 6-2 | | | | | | | | | |
15‑Aug‑1983 | Cincinnati | Hard | R64 | 90 | 89 | Mike Bauer [USA] d. Gitlin | 4-6 6-0 6-2 | | | | | | | | | |
25‑Jul‑1983 | North Conway | Clay | R64 | 90 | 56 | Eddie Dibbs [USA] d. Gitlin | 6-4 6-0 | | | | | | | | | |
18‑Jul‑1983 | Washington | Clay | R64 | 90 | 122 | (Q)Carlos Castellan [ARG] d. Gitlin | 3-6 6-0 6-4 | | | | | | | | | |
11‑Jul‑1983 | Stuttgart Outdoor | Clay | R16 | 90 | 11 | (1)Jose Higueras [ESP] d. (Q)Gitlin | 6-2 6-1 | | | | | | | | | |
11‑Jul‑1983 | Stuttgart Outdoor | Clay | R32 | 90 | 43 | (Q)Gitlin d. Roscoe Tanner [USA] | 6-4 4-6 6-0 | | | | | | | | | |
20‑Jun‑1983 | Wimbledon | Grass | R64 | 90 | 54 | Brad Gilbert [USA] d. Gitlin | 6-7 6-3 7-5 7-5 | | | | | | | | | |
20‑Jun‑1983 | Wimbledon | Grass | R128 | 90 | 32 | Gitlin d. (Q)John Sadri [USA] | 7-5 6-7 6-1 7-5 | | | | | | | | | |
13‑Jun‑1983 | Bristol | Grass | R16 | 90 | 73 | (Q)Lloyd Bourne [USA] d. Gitlin | 6-4 4-6 6-1 | | | | | | | | | |
13‑Jun‑1983 | Bristol | Grass | R32 | 90 | 132 | Gitlin d. Chris Johnstone [AUS] | 7-5 7-6 | | | | | | | | | |
6‑Jun‑1983 | Queen's Club | Grass | R64 | 90 | 115 | Peter Rennert [USA] d. Gitlin | 7-6 1-6 6-2 | | | | | | | | | |
23‑May‑1983 | Roland Garros | Clay | R32 | 90 | 1 | (2)John Mcenroe [USA] d. Gitlin | 6-3 3-6 6-3 6-1 | | | | | | | | | |
23‑May‑1983 | Roland Garros | Clay | R64 | 90 | 616 | Gitlin d. Tarik Benhabiles [FRA] | 6-3 7-6 6-2 | | | | | | | | | |
23‑May‑1983 | Roland Garros | Clay | R128 | 90 | 211 | Gitlin d. Christophe Freyss [FRA] | 5-7 6-3 6-1 6-1 | | | | | | | | | |
25‑Apr‑1983 | Tampa | Carpet | R16 | 90 | 125 | Florin Segarceanu [ROU] d. Gitlin | 7-6 6-1 | | | | | | | | | |
25‑Apr‑1983 | Tampa | Carpet | R32 | 90 | 101 | Gitlin d. Ricardo Acuna [CHI] | 6-4 6-1 | | | | | | | | | |
11‑Apr‑1983 | Los Angeles | Hard | R64 | 90 | 63 | Eric Fromm [USA] d. Gitlin | 6-4 6-2 6-4 | | | | | | | | | |
4‑Apr‑1983 | Houston-WCT | Clay | R16 | 90 | 40 | Mark Dickson [USA] d. Gitlin | 7-6 6-3 | | | | | | | | | |
4‑Apr‑1983 | Houston-WCT | Clay | R32 | 90 | 132 | Gitlin d. Chris Johnstone [AUS] | 7-5 5-7 6-1 | | | | | | | | | |
14‑Mar‑1983 | Munich WCT | Carpet | R32 | 90 | 30 | Chip Hooper [USA] d. Gitlin | 6-2 6-4 | | | | | | | | | |
21‑Feb‑1983 | La Quinta | Hard | R16 | 90 | 54 | (16)Brad Gilbert [USA] d. Gitlin | 6-2 6-0 | | | | | | | | | |
21‑Feb‑1983 | La Quinta | Hard | R32 | 90 | 184 | Gitlin d. Dick Stockton [USA] | 7-6 6-3 | | | | | | | | | |
21‑Feb‑1983 | La Quinta | Hard | R64 | 90 | 27 | Gitlin d. (8)Mel Purcell [USA] | 6-2 6-1 | | | | | | | | | |
7‑Feb‑1983 | Richmond WCT | Carpet | R32 | 90 | 33 | (7)Paul Mcnamee [AUS] d. Gitlin | 6-3 6-4 | | | | | | | | | |