Pomeranz's ERA over last 4 starts is 0.75

Left-hander ranks third in National League in ERA

Bill Center, longtime sportswriter for U-T San Diego, is an employee of the Padres.

Monday night in San Francisco marked the third time in his last four starts than left-hander Drew Pomeranz didn't allow a run.

Over his last four outings, Pomeranz has allowed two runs on 10 hits and 12 walks with 24 strikeouts in 24 innings. That's an ERA of 0.75. Over the run, Pomeranz has allowed 0.92 baserunners per inning.

Overall, Pomeranz now ranks third in the National League with a 1.70 ERA. The two pitchers ahead of him are Jake Arieta and Clayton Kershaw.

The Padres acquired the 27-year-old Pomeranz and left-handed prospect Jose Torres from Oakland last Dec. 2 for first baseman Yonder Alonzo and left-handed reliever Mark Rzepczynski. Alonso is hitting .220 for the A's. Rzepczynski has a 3.52 ERA in 21 appearances.

The previous time the Padres negotiated a trade with Oakland for a pitcher was Nov. 1, 2012, when they acquired right-hander Tyson Ross from the A's in exchange for left-handed pitcher Andrew Werner and utility infielder Andy Parrino.

Notes from the scorebook

• Since May 15, catcher Derek Norris is 2-for-24 with a double and a home run for two RBIs. His backup Christian Bethancourt is 5-for-15 since May 15 with a homer and three RBIs. Norris is hitting .173 for the season.

• Shortstop Alexei Ramirez is hitless in his last 12 at-bats and is 5-for-39 since the second game of the doubleheader at Wrigley Field on May 11.

• Utility infielder Adam Rosales has struck out 37 times in 82 at-bats this season, including in seven of his last nine at-bats, although he did draw three walks from the Dodgers last Friday.

Brett Wallace is 1-for-12 in his last five games, with a four-walk game against the Dodgers last Friday.