Giants vs. Diamondbacks Odds & Betting Predictions - May 20, 2026

Giants at Diamondbacks

7:40 pm • ARID

San Francisco Giants

20-31

3 - 6

Arizona Diamondbacks

26-24

pitcher		team	era	w-l
M.Kelly			5.71	4-3
T.Mahle			6.10	1-6

MatchupOpenSpreadTotalMoneyline
Giants 20-31	+1.5	-1.5+147	o8.5-113	-108
Diamondbacks 26-24	u8.5	-2.5-357	u8.5-108	-111

Wednesday 7:40 p.m.

May 20, 2026

Chase FieldPhoenix

Over 8.5-115

SF -104

1.25u

SF +104

Over 8.5-113

K.Marte o1.5 Total Bases+105

$1.05

ARI -130

Under 9-117

1.17u

Under 9-115

0.58u

Bet to -122

Over 9-102

0.51u

UPDATE: After lineups vomited out, I don't like this much at 9 anymore, but would still consider 8.5. (DK) Roof closed 108 Park Factor - Pitchers have combined for 33 barrels in fewer than 80 innings. Kelly 2 R/16 IP L2 starts - but only 9 Ks & 7 Barrels. SFG 4th worst pen estimators L30 days

Giants vs Diamondbacks: PRO's Top Prop Edge
Action Network Staff•
May 20, 2026 UTC

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No props found

MLB Public Betting

Diamondbacks are 4-1 in their last 5 games.
Diamondbacks are 3-2 in their last 5 games against the spread
Diamondbacks are 14-10 in their road games against the spread
The totals have gone OVER in 2 of Diamondbacks' last 5 games
The totals have gone OVER in 11 of Diamondbacks' 26 last games at home

Against the Spread (ATS) History

	overall	home	away	favorite	underdog
Diamondbacks	30-20	16-10	14-10	13-9	16-11
Giants	20-31	9-14	11-17	5-10	15-20

Over/Under History

	overall	home o/u	away o/u	favorite o/u	underdog o/u
Diamondbacks	25-23-2	11-14-1	14-9-1	9-12-1	15-11-1
Giants	23-26-2	11-11-1	12-15-1	10-5	12-21-2

Straight-Up (ML) History

	overall	home	away	favorite	underdog
Diamondbacks	26-24	16-10	10-14	14-8	11-16
Giants	20-31	10-13	10-18	7-8	13-22

date	opponent	score	spread	over/under	moneyline
May 20th	SF	W 5-3	-1.5 W	U 8.5	ARI -125
May 19th	SF	W 12-2	-1.5 W	O 9	ARI -136
May 17th	@COL	W 8-6	-1.5 W	O 10.5	ARI -147
May 16th	@COL	L 2-4	-1.5 L	U 11.5	COL -147
May 16th	@COL	W 9-1	-1.5 W	U 12	ARI -121

Corbin Burnes
SP
Burnes is out with elbow
Out
Blake Walston
SP
Walston is out with elbow
Out
Tyler Locklear
1B
Locklear is out with elbow
Out

Cristian Mena
SP
Mena is doubtful with shoulder
Doubtful

Hayden Birdsong
SP
Birdsong is out with arm
Out

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PITCHER	PC	IP	K	ER
RT.Mahle, P	79	5	6	6
RK.Winn, P	11	1	3	0
LS.Hentges, P	16	1.1	0	0
RJ.Peguero, P	12	0.2	1	0

HITTERS	H-AB	R	HR	RBI
1W.Brennan, RF	0-3	0	0	0
1J.Rodriguez, PH	0-0	0	0	0
1J.Rodriguez, RF	0-0	0	0	0
2L.Arraez, 2B	1-4	0	0	0
3C.Schmitt, LF	1-4	1	1	1
4R.Devers, 1B	1-4	0	0	0
5W.Adames, SS	0-4	0	0	0
6M.Chapman, 3B	2-4	2	0	0
7B.Eldridge, DH	1-4	0	0	1
8D.Susac, C	1-4	0	0	0
9D.Gilbert, CF	1-2	0	0	1
9H.Bader, PH	0-2	0	0	0
9H.Bader, CF	0-2	0	0	0

PITCHER	PC	IP	K	ER
RM.Kelly, P	85	6	4	3
LB.Garcia, P	9	0.2	0	0
RT.Clarke, P	6	0.1	0	0
RB.Pfaadt, P	9	1	0	0
RP.Sewald, P	13	1	1	0

HITTERS	H-AB	R	HR	RBI
1K.Marte, 2B	3-3	3	1	2
2I.Vargas, 1B	0-4	0	0	1
3G.Perdomo, SS	1-3	0	0	3
4A.Del Castillo, C	0-4	0	0	0
5L.Gurriel, DH	0-4	0	0	0
6J.Fernandez, 3B	2-4	0	0	0
7J.Barrosa, RF	0-3	0	0	0
8T.Tawa, LF	1-3	1	0	0
9R.Waldschmidt, CF	2-3	2	0	0