Pirates vs Giants Prediction, Odds, Moneyline, Spread & Over/Under for May 9

Odds updated as of 8:11 p.m.

Saturday's slate in the MLB includes a matchup between the San Francisco Giants and the Pittsburgh Pirates.

Before you do any MLB betting on this game at FanDuel Sportsbook, here's everything you need to know.

Giants vs Pirates Game Info

• San Francisco Giants (15-23) vs. Pittsburgh Pirates (21-18)
• Date: Saturday, May 9, 2026
• Time: 9:05 p.m. ET
• Venue: Oracle Park -- San Francisco, California
• Coverage: NBCS-BA and SportsNet PT

Giants vs Pirates Odds & Moneyline

• All MLB odds, betting lines and prop bets are available on FanDuel Sportsbook.
• Moneyline: SF: (-112) | PIT: (-104)
• Spread: SF: +1.5 (-192) | PIT: -1.5 (+158)
• Total: 8.5 -- Over: (+100) | Under: (-122)

Giants vs Pirates Probable Starting Pitchers

Probable Pitchers: Landen Roupp (Giants) - 5-2, 3.18 ERA vs Braxton Ashcraft (Pirates) - 1-2, 3.02 ERA

The Giants will give the ball to Landen Roupp (5-2, 3.18 ERA), who is eyeing win No. 6 on the season, and the Pirates will counter with Braxton Ashcraft (1-2, 3.02 ERA). When Roupp starts, his team is 4-3-0 against the spread this season. Roupp's team has a record of 1-2 this season when he starts and they are the favorite on the moneyline. The Pirates are 3-4-0 ATS in Ashcraft's seven starts with a set spread. The Pirates were named the moneyline underdog for two Ashcraft starts this season -- they split the games.

Giants vs Pirates Prediction & Pick

All MLB win probability predictions and picks are according to numberFire.
Prediction: Giants win (50.6%)

Giants vs Pirates Moneyline

• Pittsburgh is a -104 underdog on the moneyline, while San Francisco is a -112 favorite at home.

Giants vs Pirates Spread

• The Pirates are 1.5-run favorites against the spread for this matchup with the Giants. The Pirates are +158 to cover, while the Giants are -192 to cover as a 1.5-run underdog on the runline.

Giants vs Pirates Over/Under

• Giants versus Pirates on May 9 has an over/under of 8.5 runs, with the odds on the over +100 and the under set at -122.

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Giants vs Pirates Betting Trends

• The Giants have come away with five wins in the 12 contests they have been listed as the favorites in this season.
• San Francisco has a record of 4-6 when favored by -112 or more this year.
• Contests with the Giants have gone over the total set by oddsmakers in 15 of 38 chances this season.
• The Giants are 16-22-0 against the spread in their 38 games that had a posted line this season.
• The Pirates have won 40% of the games this season they were the moneyline underdog (6-9).
• Pittsburgh is 6-9 (winning 40% of its games) when it has played as a moneyline underdog of -104 or longer.
• The Pirates have had an over/under set by oddsmakers 38 times, and have combined with opponents to go over the total in 19 of those games (19-18-1).
• The Pirates have a 19-19-0 record ATS this season (covering 50% of the time).

Giants Player Leaders

• Luis Arraez has an OPS of .732, fueled by an OBP of .338 and a team-best slugging percentage of .394 this season. He has a .314 batting average.
• Among all qualified hitters in the majors, he ranks 15th in batting average, 81st in on-base percentage, and 97th in slugging.
• Arraez hopes to build on a two-game hitting streak in this matchup. In his last five games he is batting .368 with four doubles and two RBIs.
• Casey Schmitt has 35 hits and an OBP of .341, both of which lead the Giants this season. He's batting .294 and slugging .529.
• Among qualifiers, he ranks 29th in batting average, 78th in on-base percentage and 21st in slugging percentage.
• Jung Hoo Lee has collected 37 base hits, an OBP of .315 and a slugging percentage of .387 this season.
• Matt Chapman is batting .227 with a .301 OBP and 12 RBI for San Francisco this season.

Pirates Player Leaders

• Brandon Lowe leads the Pirates with 33 hits. He's batting .262 and slugging .563 with an on-base percentage of .363.
• Including all qualifying hitters in the big leagues, he ranks 68th in batting average, 48th in on-base percentage and 11th in slugging percentage.
• Oneil Cruz leads his team with a .461 slugging percentage. He has a batting average of .247 with an on-base percentage of .314.
• He ranks 96th in batting average, 118th in on-base percentage and 48th in slugging percentage in MLB.
• Bryan Reynolds has put up a team-best .395 on-base percentage.
• Ryan O'Hearn paces his team with a .443 slugging percentage.

Giants vs Pirates Head to Head

• 5/8/2026: 5-2 SF (Favorite: Giants, Spread: -1.5, Total: 7.5, Favorite Moneyline: -108, Underdog Moneyline: -108)
• 8/6/2025: 4-2 SF (Favorite: Giants, Spread: -1.5, Total: 8, Favorite Moneyline: -154, Underdog Moneyline: +130)
• 8/5/2025: 8-1 SF (Favorite: Giants, Spread: -1.5, Total: 7.5, Favorite Moneyline: -144, Underdog Moneyline: +122)
• 8/4/2025: 5-4 PIT (Favorite: Giants, Spread: -1.5, Total: 8.5, Favorite Moneyline: -126, Underdog Moneyline: +108)
• 7/30/2025: 2-1 PIT (Favorite: Giants, Spread: -1.5, Total: 7, Favorite Moneyline: -210, Underdog Moneyline: +176)
• 7/29/2025: 3-1 PIT (Favorite: Giants, Spread: -1.5, Total: 8, Favorite Moneyline: -174, Underdog Moneyline: +146)
• 7/28/2025: 6-5 PIT (Favorite: Giants, Spread: -1.5, Total: 7.5, Favorite Moneyline: -136, Underdog Moneyline: +116)
• 5/23/2024: 7-6 SF (Favorite: Pirates, Spread: -1.5, Total: 8, Favorite Moneyline: -184, Underdog Moneyline: +154)
• 5/22/2024: 9-5 SF (Favorite: Pirates, Spread: -1.5, Total: 7.5, Favorite Moneyline: -126, Underdog Moneyline: +108)
• 5/21/2024: 7-6 PIT (Favorite: Giants, Spread: -1.5, Total: 8.5, Favorite Moneyline: -132, Underdog Moneyline: +112)

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