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

Several days ago, manager Andy Green said the Padres would likely use 15 pitchers in the bullpen by the time the season is over.

That number might be low.

The Padres have already used 11 relief pitchers and have the 12th waiting in the wings.

Before Sunday's finale to a 7-3 road trip, the Padres recalled right-handed relievers Phil Maton and Luis Perdomo from Triple-A El Paso and dispatched right-handers Robert Stock and Gerardo Reyes to the Chihuahuas.

Maton appeared in Sunday's game.

Left-hander Jose Castillo opened the season on the disabled list and has yet to appear this season. Left-hander Aaron Loup is also on the disabled list.

Stock is experiencing the same command and control problems that troubled him during his first outings of Spring Training. Stock issued six walks (and nine hits) in his first seven appearances of the season covering six innings. He also had nine strikeouts with a 9.00 ERA. Half of the 126 pitches he had thrown this season missed the strike zone -- including eight of the nine he threw Saturday night.

Notebook
Shortstop Fernando Tatis Jr. finished his first Major League road trip with a four-game hitting streak (6-for-18) with a double, two homers and five RBIs. He was 10-for-31 on the trip with four of his five homers on the season. He also had two doubles and three walks for a road slash line of .323/.382/.774/1.156. The 20-year-old also finished the trip by homering in back-to-back games.

• Center fielder Manuel Margot was 12-for-31 (.387) on the trip with three doubles, two homers and five RBIs for a .387 on-base percentage and a .677 slugging percentage for a 1.064 OPS. He hit safely in eight of the last nine games on the trip. His game-opening homer off Zack Greinke Sunday was the sixth of his career.

• Catchers Austin Hedges (2-for-23) and Francisco Mejia (1-for-16) are a combined 3-for-39 since April 3 with 15 strikeouts.

• Left-hander Eric Lauer has allowed three earned runs or fewer in 11 of his 14 career starts against National League West teams. But he has given up 12 runs on 16 hits (including four homers) and four walks in 16 innings in his last three starts.