Giants left-hander Madison Bumgarner underwent surgery to insert three pins into his left pinkie finger on Saturday. He's expected to be sidelined for six to eight weeks.
Bumgarner was hit in the left hand by a line drive off the bat of Royals second baseman Whit Merrifield during a Cactus League game on Friday, resulting in a fracture of the fifth metacarpal. According to an Associated Press report, manager Bruce Bochy said it would be "a couple months, give or take," before Bumgarner would be back on the mound for San Francisco.
Bumgarner, 28, owns a 3.01 ERA and 1.10 WHIP over nine Major League seasons. He is a four-time All-Star and was named the Most Valuable Player of the National League Championship Series and World Series in 2014, winning his third World Series championship with the Giants. The club's ace also missed nearly three months in 2017 after a dirt bike accident on an off-day in Colorado last April. Prior to that, Bumgarner hadn't made fewer than 31 starts in a season since 2010, his rookie year.

The Giants will also be without their No. 3 starter, right-hander Jeff Samardzija, to open the season after an MRI revealed a right pectoral strain. He will likely miss three to four weeks of the regular season. Samardzija posted a 4.42 ERA in 32 starts for the Giants last season, though his Fielding Independent Pitching (FIP) was nearly a full run lower, at 3.61. He also led the National League with 207 2/3 innings pitched and 1.4 walks per nine innings. 
With right-hander Johnny Cueto scheduled to start Sunday to open the Bay Bridge Series in Oakland, it appears left-hander Ty Blach will likely start on Opening Day against the Dodgers in Los Angeles.
Blach has a 1.67 ERA in four career starts against the Dodgers. Still classified as a rookie in 2017, he spent most of last year in the Giants' rotation and finished with a 4.78 ERA in 34 appearances (24 starts).