Arizona Diamondbacks vs San Francisco Giants Prediction 5/19/26 MLB Picks Today

The San Francisco Giants and the Arizona Diamondbacks meet Tuesday in MLB action from Chase Field. We will look at this from a betting perspective and determine the best bets for this game. Here’s a San Francisco Giants vs. Arizona Diamondbacks prediction.

Starting Pitching Matchup

The San Francisco Giants will send out Landen Roupp and Roupp is 5-4 with a 3.49 ERA and 58 strikeouts this season. This will be Roupp’s second career start against the Diamondbacks. Ryne Nelson will start for the Diamondbacks and is 1-3 with a 5.40 ERA and 43 strikeouts this season. In his last five starts against the Giants, Nelson is 1-0 with a 2.43 ERA and 18 strikeouts.

San Francisco Giants Recap

The San Francisco Giants come into this game looking to bounce back from a 12-2 loss at the hands of the Arizona Diamondbacks last time out to sit at 20-28 this season. After this series, the Giants will square off against the Chicago White Sox at home.

Giants Have Two-Game Win Streak Snapped

Entering Monday, Luis Arraez has 57 hits with 9 doubles, 2 triples and 16 RBIs while Willy Adames has 44 hits with 14 doubles, 3 home runs and 13 RBIs along with 56 strikeouts. Matt Chapman has 39 hits with 11 doubles, a triple, a home run and 16 RBIs and Jung Hoo Lee has 47 hits with 10 doubles and 17 RBIs. Heliot Ramos has 44 hits with 12 doubles, 4 home runs and 20 RBIs this season. Rafael Devers also has 44 hits with 10 doubles, 5 home runs and 19 RBIs but also has 59 strikeouts this season.

Arizona Diamondbacks Recap

The Arizona Diamondbacks come into this game looking to add on to their win over San Francisco last time out to sit at 23-23 this season. After this series, the Diamondbacks will take on the Rockies in a series rematch at home.

Diamondbacks Win Back-To-Back Games

Going into Monday, Corbin Carroll has 42 hits including 11 doubles, 4 triples, 7 home runs and 24 RBIs while Alek Thomas has logged 9 doubles with 2 home runs and 10 RBIs as well this season. Ketel Marte has 36 hits with 6 doubles, 5 home runs and 15 RBIs and Geraldo Perdomo has 33 hits, with 7 doubles, 3 triples, 2 home runs and 12 RBIs as well this season. Nolan Arenado also has 39 hits with 7 doubles, 6 home runs and 21 RBIs and Jose Fernandez has 33 hits with 3 home runs and 14 RBIs this season. Ildemaro Vargas also has 51 hits with 8 doubles, 2 triples, 7 home runs and 31 RBIs.

San Francisco Giants @ Arizona Diamondbacks Betting Trends: May 19, 2026

• Probable Starting Pitcher: Ryne Nelson      Record this season: 1-3      ERA: 5.40
• Home Record: 0-2
• Last 5 against Giants: 1-0

Why the Arizona Diamondbacks will win

• The Diamondbacks have won nine of their last 10 night games against the Giants at Chase Field following a win.
• The Giants have lost seven of their last eight road games following a loss.
• The Diamondbacks have covered the run line in seven of their last eight home games against National League opponents following a win.
• The Giants have failed to cover the run line in each of their last three games against NL West opponents.
• The Diamondbacks have won the first inning in six of their last seven night games against NL West opponents that held a losing record.
• The Diamondbacks have led after 3 innings in eight of their last nine games as favorites against National League opponents.
• The Diamondbacks have led after 5 innings in 10 of their last 11 night games against NL West opponents that held a losing record.

• Probable Starting Pitcher: Landen Roupp      Record this season: 5-4      ERA: 3.49
• Road Record: 3-2
• Last 5 against Diamondbacks: 0-0

Why the San Francisco Giants will win

• The Giants have won four of their last five games as underdogs against NL West opponents following a loss.
• The Diamondbacks have lost six of their last eight night games against NL West opponents.
• The Giants have covered the run line in eight of their last nine games as underdogs against National League opponents following a road loss.
• The Diamondbacks have failed to cover the run line in four of their last five games against the Giants following a home win.
• The Diamondbacks have trailed after 3 innings in 11 of their last 12 Tuesday games.

Total Runs Facts

• Five of the Diamondbacks’ last six home games have gone UNDER the total runs line.
• Each of the Giants’ last three games have gone OVER the total runs line.
• The ‘Inning 1 OVER 0.5 runs’ market has hit in each of the Giants’ last nine Tuesday games against NL West opponents.
• The ‘Inning 1 OVER 0.5 runs’ market has hit in each of the last five night games between the Giants and Diamondbacks at Chase Field.

Arizona Diamondbacks Player Prop Facts

• Nolan Arenado has hit a home run in two of his last three appearances against the Giants.
• Ryne Nelson has recorded five or more strikeouts in each of his last three appearances against the Giants.
• Corbin Carroll has recorded at least one hit in each of his last 18 appearances in night games against NL West teams that held a losing record.
• Ildemaro Vargas ranks 2nd amongst qualified players for Batting Average (.335) this season.

San Francisco Giants Player Prop Facts

• Willy Adames has hit a home run in three of the Giants’ last eight games as underdogs against the Diamondbacks.
• Jung Hoo Lee has recorded a hit in each of the Giants’ last five games.
• Luis Arraez ranks T3rd in the league in Hits (57) this season.

Matchup/League Facts

• The Diamondbacks rank 1st in the league for triples this season (13).
• The Diamondbacks rank 29th in the league for strikeouts this season (340).
• The Giants rank 30th in the league for runs scored this season (167).
• The Giants rank 30th in the league for RBIs this season (161).

San Francisco Giants vs. Arizona Diamondbacks Prediction

I’m on the under in this one. I still don’t trust this Giants offensively and Nelson has some solid numbers in his career against the Giants. On the flipside, I think Roupp is better than his current ERA, and I think that he has a solid start against the Diamondbacks here and I like this game to go under the total.