29‑Nov‑1983 | Australian Open | Grass | R64 | 50 | 30 | (15)Tim Mayotte [USA] d. Giammalva Jr | 7-5 6-3 6-4 | | | | | | | | | |
29‑Nov‑1983 | Australian Open | Grass | R128 | 50 | | Giammalva Jr d. David Mustard [NZL] | 6-2 7-6 2-6 6-3 | | | | | | | | | |
7‑Nov‑1983 | Taipei | Carpet | R32 | 44 | | (Q)Matt Anger [USA] d. (4)Giammalva Jr | 6-3 3-6 6-3 | | | | | | | | | |
31‑Oct‑1983 | Hong Kong | Hard | F | 48 | | Wally Masur [AUS] d. Giammalva Jr | 6-1 6-1 | | | | | | | | | |
31‑Oct‑1983 | Hong Kong | Hard | SF | 48 | 50 | Giammalva Jr d. Brad Gilbert [USA] | 6-4 7-6 | | | | | | | | | |
31‑Oct‑1983 | Hong Kong | Hard | QF | 48 | | Giammalva Jr d. Rod Frawley [AUS] | 6-4 6-2 | | | | | | | | | |
31‑Oct‑1983 | Hong Kong | Hard | R16 | 48 | 80 | Giammalva Jr d. Brad Drewett [AUS] | 6-2 6-3 | | | | | | | | | |
31‑Oct‑1983 | Hong Kong | Hard | R32 | 48 | | Giammalva Jr d. Francisco Gonzalez [PAR] | 6-2 7-6 | | | | | | | | | |
24‑Oct‑1983 | Tokyo Indoor | Carpet | R32 | 44 | 2 | (1)Ivan Lendl [USA] d. Giammalva Jr | 7-5 6-1 | | | | | | | | | |
17‑Oct‑1983 | Tokyo Outdoor | Hard | R32 | 42 | | Todd Nelson [USA] d. (9)Giammalva Jr | 6-2 6-3 | | | | | | | | | |
17‑Oct‑1983 | Tokyo Outdoor | Hard | R64 | 42 | | (9)Giammalva Jr d. (Q)David Dowlen [USA] | 6-3 6-2 | | | | | | | | | |
12‑Sep‑1983 | Dallas | Hard | R32 | 42 | 98 | (Q)Van Winitsky [USA] d. Giammalva Jr | 7-6 3-6 7-5 | | | | | | | | | |
30‑Aug‑1983 | US Open | Hard | R64 | 39 | 15 | (14)Eliot Teltscher [USA] d. Giammalva Jr | 6-2 6-3 5-7 4-6 6-2 | | | | | | | | | |
30‑Aug‑1983 | US Open | Hard | R128 | 39 | 85 | Giammalva Jr d. Jay Lapidus [USA] | 7-5 6-4 6-4 | | | | | | | | | |
15‑Aug‑1983 | Cincinnati | Hard | R32 | 40 | 87 | Florin Segarceanu [ROU] d. Giammalva Jr | 6-3 6-4 | | | | | | | | | |
15‑Aug‑1983 | Cincinnati | Hard | R64 | 40 | 23 | Giammalva Jr d. (13)Henri Leconte [FRA] | 6-4 2-0 RET | | | | | | | | | |
8‑Aug‑1983 | Montreal / Toronto | Hard | R16 | 52 | 3 | (3)Jimmy Connors [USA] d. Giammalva Jr | 6-0 6-4 | | | | | | | | | |
8‑Aug‑1983 | Montreal / Toronto | Hard | R32 | 52 | 58 | Giammalva Jr d. Chip Hooper [USA] | 6-4 7-5 | | | | | | | | | |
8‑Aug‑1983 | Montreal / Toronto | Hard | R64 | 52 | 26 | Giammalva Jr d. (13)Hank Pfister [USA] | 6-4 6-0 | | | | | | | | | |
18‑Jul‑1983 | Kitzbuhel | Clay | R16 | 54 | | (15)Zoltan Kuharszky [HUN] d. (7)Giammalva Jr | 6-0 4-6 6-1 | | | | | | | | | |
18‑Jul‑1983 | Kitzbuhel | Clay | R32 | 54 | | (7)Giammalva Jr d. Givaldo Barbosa [BRA] | 1-6 6-2 6-4 | | | | | | | | | |
11‑Jul‑1983 | Stuttgart Outdoor | Clay | R16 | 50 | | (8)Chris Lewis Nzl [NZL] d. Giammalva Jr | 2-6 6-0 6-2 | | | | | | | | | |
11‑Jul‑1983 | Stuttgart Outdoor | Clay | R32 | 50 | | Giammalva Jr d. Peter Elter [GER] | 6-4 6-3 | | | | | | | | | |
4‑Jul‑1983 | Gstaad | Clay | QF | 55 | 81 | Libor Pimek [BEL] d. (8)Giammalva Jr | 6-3 7-5 | | | | | | | | | |
4‑Jul‑1983 | Gstaad | Clay | R16 | 55 | | (8)Giammalva Jr d. Givaldo Barbosa [BRA] | 6-2 6-2 | | | | | | | | | |
4‑Jul‑1983 | Gstaad | Clay | R32 | 55 | 80 | (8)Giammalva Jr d. Sergio Casal [ESP] | 6-2 6-7 6-0 | | | | | | | | | |
20‑Jun‑1983 | Wimbledon | Grass | R128 | 45 | 14 | (11)Johan Kriek [USA] d. Giammalva Jr | 6-4 6-3 6-2 | | | | | | | | | |
6‑Jun‑1983 | Queen's Club | Grass | R32 | 48 | | Cassio Motta [BRA] d. Giammalva Jr | 7-6 3-6 7-5 | | | | | | | | | |
6‑Jun‑1983 | Queen's Club | Grass | R64 | 48 | 27 | Giammalva Jr d. (14)John Alexander [AUS] | 4-6 7-6 7-5 | | | | | | | | | |
1‑May‑1983 | Forest Hills WCT | Clay | R32 | 49 | | W/O | | | | | | | | | |
24‑Apr‑1983 | Las Vegas | Hard | QF | 51 | 23 | Mark Edmondson [AUS] d. Giammalva Jr | 6-1 3-6 6-2 | | | | | | | | | |
24‑Apr‑1983 | Las Vegas | Hard | R16 | 51 | 85 | Giammalva Jr d. Trey Waltke [USA] | 3-6 6-3 6-4 | | | | | | | | | |
24‑Apr‑1983 | Las Vegas | Hard | R32 | 51 | 61 | Giammalva Jr d. Vincent Van Patten [USA] | 6-4 6-2 | | | | | | | | | |
4‑Apr‑1983 | Houston-WCT | Clay | QF | 59 | 18 | (4)Bill Scanlon [USA] d. Giammalva Jr | 6-2 6-2 | | | | | | | | | |
4‑Apr‑1983 | Houston-WCT | Clay | R16 | 59 | 90 | Giammalva Jr d. Tom Cain [USA] | 6-4 7-6 | | | | | | | | | |
4‑Apr‑1983 | Houston-WCT | Clay | R32 | 59 | 19 | Giammalva Jr d. (5)Wojtek Fibak [POL] | 6-4 6-1 | | | | | | | | | |
14‑Mar‑1983 | Rotterdam | Hard | R32 | 51 | 52 | Russell Simpson [NZL] d. Giammalva Jr | 6-3 6-0 | | | | | | | | | |
7‑Mar‑1983 | Nancy | Hard | R32 | 53 | | Wally Masur [AUS] d. Giammalva Jr | 6-3 6-4 | | | | | | | | | |
28‑Feb‑1983 | Monterrey | Carpet | F | 74 | | (1)Giammalva Jr d. (8)Ben Testerman [USA] | 6-4 3-6 6-3 | | | | | | | | | |
28‑Feb‑1983 | Monterrey | Carpet | SF | 74 | | (1)Giammalva Jr d. (7)Erick Iskersky [USA] | 6-4 7-6 | | | | | | | | | |
28‑Feb‑1983 | Monterrey | Carpet | QF | 74 | | (1)Giammalva Jr d. Terry Moor [USA] | 1-6 7-5 6-3 | | | | | | | | | |
28‑Feb‑1983 | Monterrey | Carpet | R16 | 74 | | (1)Giammalva Jr d. Charles Buzz Strode [USA] | 7-6 6-3 | | | | | | | | | |
28‑Feb‑1983 | Monterrey | Carpet | R32 | 74 | | (1)Giammalva Jr d. (Q)Ross Case [AUS] | 7-6 6-7 6-1 | | | | | | | | | |
21‑Feb‑1983 | La Quinta | Hard | R64 | 69 | 1 | (1)Jimmy Connors [USA] d. Giammalva Jr | 6-2 6-3 | | | | | | | | | |
14‑Feb‑1983 | Memphis | Carpet | R64 | 69 | 41 | Mike De Palmer [USA] d. (Q)Giammalva Jr | 6-4 5-7 7-6 | | | | | | | | | |
31‑Jan‑1983 | Caracas | Hard | R16 | 68 | | Tim Gullikson [USA] d. (8)Giammalva Jr | 6-2 6-4 | | | | | | | | | |
31‑Jan‑1983 | Caracas | Hard | R32 | 68 | | (8)Giammalva Jr d. (Q)Loic Courteau [FRA] | 6-1 6-2 | | | | | | | | | |