SAN FRANCISCO (Interstat) — The Pittsburgh Pirates look to build on their strong start to the season when they face the San Francisco Giants on Saturday at Oracle Park.

First pitch is set for 4:05 p.m. PDT under cloudy skies with temperatures around 58 degrees.

Pittsburgh (21-17) enters the contest with one of the National League’s better records, while San Francisco (14-23) has struggled to find consistency. The Pirates won the series opener 1-0 on Friday, a low-scoring affair that extended their recent momentum.

Right-hander Braxton Ashcraft (1-2, 4.50 ERA) is scheduled to start for Pittsburgh. The Giants have not announced a probable pitcher.

A player to watch for the Pirates is right-hander Mitch Keller, who has been dominant over his last four starts, posting a 4-0 record with a 2.88 ERA and 21 strikeouts in 25 innings. His most recent outing was a win Thursday at Arizona, where he allowed two earned runs over six innings with four strikeouts.

For San Francisco, right-hander Adrian Houser has struggled this season, carrying a 1-4 record and a 6.60 ERA. He took the loss Wednesday against San Diego, surrendering one earned run over six innings but receiving little run support. Houser has allowed at least four earned runs in three of his last four starts.

The Pirates have won eight of their past 10 games, including series victories over Cincinnati and Arizona. Their offense has been productive, scoring 17 runs in a win over the Reds on May 2 and averaging nearly six runs per game over the last week.

The Giants have lost six of their past seven, with their only win during that stretch a 3-2 victory against San Diego on Monday. San Francisco has been held to two runs or fewer in five of those seven games.

Saturday’s game is the second of a three-game series. The Pirates continue their road trip Sunday before returning home to face Colorado on Tuesday. The Giants travel to Los Angeles to open a four-game set against the Dodgers on Monday.

Interstat’s game simulator projects a 5-2 Pirates victory, though its ELO system gives San Francisco a 52.2 percent probability to win.