Pujols has cooled off a bit after a recent hot streak. Over his past 10 games, he is batting .214 with a home run and five RBI.
C.J. Cron will get the start at first base, with former Indian David Murphy serving as the designated hitter and batting cleanup on Monday.
Morrison is dealing with a thumb injury and has not started a game since last Wednesday. He is hitting .158 with one double and four RBI in his last 14 games (10 starts).
Morrison, who had one at-bat Saturday, has not started since Wednesday. His other issue is production - he has not had a multi-hit game since June 15. His average has fallen from .261 to .220 during that stretch.
Heading into Saturday, Shaw had three hits in his nine previous games this season. He more than doubled that in the game, going 4 for 4 with a walk.
Shaw hit his first two career home runs in the game and scored five times. He's the first MLB player to hit his first and second career homers in the same game since Jose Abreu on April 8 of last season.
"He's a good player, really good," said Red Sox starter Joe Kelly, per MLB.com. "He was probably pressing a little bit when he was first called up. He got his first Major League hit a couple times ago. He's seeing the ball really well and being confident at the plate and putting some good swings. He had a really good day."
Max Muncy gets the call at the hot corner for Saturday's game, starting for the first time since June 28 and ninth time this year.
Morrison suffered a thumb injury in Wednesday's game and hasn't played since.
Jesus Montero starts at first base for the second straight game and fourth time this season.
Shaw posted a .249/.318/.356 slash line at Triple-A Pawtucket before being summoned, though he did earn 15 at-bats with Boston earlier in the year.
Teixeira has homered twice in a game four times this season, and three of them have come in July. Nine of his 28 homers on the year came in the month of July.
Teixeira went 3 for 4, walked twice and drove in a season-high six runs.
Abreu's homer extended his hitting streak to 11 games. He's hitting .381 over the streak. He homered for the second straight game.
Mauer's hitless day snapped an 11-game hitting streak. He hit .295 with .726 OPS over the streak.