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Jake Mangum went 4-for-6 with two RBIs for the Tampa Bay Rays, who scored twice in the 11th inning to upend the host Boston Red Sox 10-8 in the opener of a three-game series on Monday night.

After Junior Caminero drew a bases-loaded, full-count walk off Red Sox reliever Zack Kelly (1-3), Mangum beat out an RBI infield single that delivered an insurance run and helped Massachusetts native Ian Seymour (1-0) earn a win in his MLB debut.

Yandy Diaz and Jonathan Aranda also had multiple hits for the victorious Rays.

Seven of the 10 half-innings from the seventh through 11th featured scoring, but Tampa Bay held the hosts to 4-for-23 with runners in scoring position.

Aranda hit a two-out RBI single during Tampa Bay’s three-run seventh, and after Trevor Story’s RBI single brought Boston within a run in the bottom half, the first baseman skied a ninth-inning sacrifice fly to center field.

The Red Sox, though, would not be denied in the ninth. After Rafael Devers drew a leadoff walk and Abraham Toro cranked a wall-ball double, Roman Anthony — MLB.com’s No. 1 prospect who was making his big-league debut — recorded an RBI groundout and Kristian Campbell knocked a game-tying RBI single over the pitcher’s mound.

In the 10th, a Taylor Walls sac fly gave Tampa the lead, but Toro reached on Aranda’s fielding error that allowed Ceddanne Rafaela to score another tying run for Boston.

Red Sox manager Alex Cora was ejected for arguing a strikeout call in Romy Gonzalez’s penultimate at-bat of the game in the 11th.

Story, Gonzalez and Rafaela all had two hits for Boston.

Anthony, who was recalled from Triple-A Worcester earlier in the day, went 0-for-4 with a walk and the aforementioned RBI.

Tampa’s Shane Baz and Boston’s Brayan Bello traded zeroes through three innings before the visitors scored on Mangum’s two-out RBI single in the fourth and twice more in the fifth to take the lead.

An inning after Mangum’s go-ahead RBI, the Rays added to their advantage in a two-run fifth as Brandon Lowe and Diaz knocked two-out RBI singles. The latter preceded a misplay by Anthony in right, but Bello recovered to strike out Aranda to end the inning.

Marcelo Mayer’s leadoff double and a following single by Rafaela set the table for Boston in the fifth. Connor Wong’s double-play groundout plated the first run.

The Red Sox made it 3-3 after a two-run double by Gonzalez — a line drive down the right-field line off reliever Garrett Cleavinger, scoring Devers (walk) and Toro (hit by pitch).

The Rays broke the game back open in a three-run seventh, including Josh Lowe’s go-ahead double into the right-center gap. Walls scored after drawing a leadoff walk. Aranda added an insurance RBI single later in the frame. A Toro RBI groundout and Story’s single brought the hosts back within one in their half.

–Field Level Media