"At some point, the runs are going to come," Scioscia said. "We feel they're going to come. We hit some balls hard. We just needed a couple of them to fall in."
Albert Pujols had two hits for the Angels, who have lost four of six to drop back to .500 (23-23).
Three players in Los Angeles' starting lineup are batting below .172, and none are doing better than the .292 of Mike Trout, who went 0 for 4. The Angels were shut out for the third time in May — matching their shutout total from the entire 2014 season, when they led the majors in runs scored.
"It happens, but we know what kind of team we have," said Shoemaker, who pitched seven innings of four-hit ball in his best start of the season. "On the offensive side, we're not worried. We know we can do it."
Smith had worked 9 2/3 scoreless innings in his last eight appearances before imploding in the 10th. His ERA soared from 2.18 to 3.80.
Kemp equaled his RBI total from his previous 15 games with his big hit for the Padres. Led by their slugging right fielder mired in a 16-for-91 slump in May, San Diego broke open a scoreless game by batting around in the extra inning to win for just the second time in seven games.
"We needed that," said Kemp, who also hit in the cleanup spot for the first time all year. "Felt like we needed to win that game right there. Felt excited I could get that hit for our team."
Jedd Gyorko snapped an 0-for-13 skid with a single leading off the 10th. After Yangervis Solarte and Will Venable walked, Smith struck out Justin Upton before Kemp put his drive into the corner, clearing the bases.
The slumping Kemp has just one homer all year and hadn't driven in a run since May 17, but he delivered just down the I-5 freeway from his longtime home at Dodger Stadium.
"I feel like I can still hit," Kemp said. "I'm still a good hitter. I'm going to just go through those stretches where things aren't working your way."
Derek Norris then scored Kemp with a single off Vinny Pestano.
Dale Thayer (1-0) pitched the ninth for the Padres, who had lost eight of 10.
Two struggling lineups were no match for starters Shoemaker and Odrisamer Despaigne, who pitched six innings of five-hit ball without a walk.
Shoemaker entered with just one victory in his six previous starts, but he wasn't thrown off his game when Venable's comebacker hit him in the foot in the first inning, although the right-hander did make a two-base throwing error after fielding the ball.
"It's disappointing we didn't win the game, but I'm definitely encouraged, for sure," Shoemaker said. "I had better execution, better focus. Everything was better."
Until the extra inning, the highlight of a pitching-dominated game was Venable's spectacular snare of Trout's long drive to center in the third inning. Trout crushed Despaigne's fastball 409 feet to the deepest part of the Big A outfield, but Venable leaped at the wall and robbed him of a homer.
Padres: The tendinitis in 1B Wil Myers' left wrist has improved, manager Bud Black said. He was eligible to come off the disabled list Tuesday, but will remain inactive until he feels even better.
Padres: Hard-luck Andrew Cashner (1-7, 2.89 ERA) has lost five straight decisions despite a 3.00 ERA in that stretch.
Angels: Garrett Richards (4-2, 2.98 ERA) starts on his 27th birthday. He has never lost an interleague game.
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