J.D. Martinez hit two homers, rookie Michael Chavis drove in five runs and the surging Boston Red Sox beat the stumbling Seattle Mariners 11-2 to complete a three-game sweep Sunday at soggy Fenway Park.

It was the fifth straight win and 16th in 22 games for the defending World Series champions. Martinez had three RBIs and scored three runs, and Chavis finished with three singles.

Omar Narváez homered for Seattle (20-23), which has lost four in a row and 15 of 19 after opening 13-2. The Mariners were outscored 34-8 in the series, completing a 2-8 road trip.

Boston Red Sox's Xander Bogaerts, left, welcomes home J.D. Martinez, right, after Martinez hit a homerun off a pitch by Seattle Mariners' Marco Gonzales during the first inning of a baseball game at Fenway Park, Sunday, May 12, 2019, in Boston. (AP Photo/Steven Senne)
Boston Red Sox’s Xander Bogaerts, left, welcomes home J.D. Martinez, right, after Martinez hit a homerun off a pitch by Seattle Mariners’ Marco Gonzales during the first inning of a baseball game at Fenway Park, Sunday, May 12, 2019, in Boston. (AP Photo/Steven Senne)

Playing in steady light-to-moderate rain the entire time with temperatures in the mid-40s, the Mariners made five fielding blunders in the first three innings. Boston even had a few baserunners that appeared somewhat cautious in the conditions.

Spot starter Hector Velázquez (1-2) gave up two runs in five innings for the Red Sox.

Trailing 1-0, the Red Sox scored three runs with two outs in the first. Martinez got it started with his homer into the Green Monster seats off Marco Gonzales (5-2). Xander Bogaerts walked and Rafael Devers singled before Chavis hit a bloop to shallow right that second baseman Shed Long overran. Then he slipped and fell when he tried to retreat as the ball dropped in for an RBI single.

Boston Red Sox's Michael Chavis runs toward first after hitting an RBI-single off a pitch by Seattle Mariners' Marco Gonzales during the first inning of a baseball game at Fenway Park, Sunday, May 12, 2019, in Boston. (AP Photo/Steven Senne)
Boston Red Sox’s Michael Chavis runs toward first after hitting an RBI-single off a pitch by Seattle Mariners’ Marco Gonzales during the first inning of a baseball game at Fenway Park, Sunday, May 12, 2019, in Boston. (AP Photo/Steven Senne)

Devers scored on Narváez’s passed ball to make it 3-1, and he appeared to step gingerly on the slippery plate.

In the second, Seattle right fielder Jay Bruce dropped Mookie Betts’ fly ball, allowing Andrew Benintendi to score to make it 4-1. Long also dropped a pop the next inning, but got a force out.

Chavis had a two-run single in the fifth, and another in the seventh. Martinez’s second homer also cleared the Monster.

Boston Red Sox's Xander Bogaerts, left, and J.D. Martinez, right celebrate their win over the Seattle Mariners in a baseball game at Fenway Park, Sunday, May 12, 2019, in Boston. (AP Photo/Steven Senne)
Boston Red Sox’s Xander Bogaerts, left, and J.D. Martinez, right celebrate their win over the Seattle Mariners in a baseball game at Fenway Park, Sunday, May 12, 2019, in Boston. (AP Photo/Steven Senne)

Gonzales gave up four runs, two earned, in four innings.

TRAINER’S ROOM

Mariners: Placed RHP Félix Hernández on the injured list with a strained right shoulder.

Boston Red Sox's Rafael Devers (11) takes his at-bat as fans watch in the rain in the seventh inning of a baseball game against the Seattle Mariners at Fenway Park, Sunday, May 12, 2019, in Boston. (AP Photo/Steven Senne)
Boston Red Sox’s Rafael Devers (11) takes his at-bat as fans watch in the rain in the seventh inning of a baseball game against the Seattle Mariners at Fenway Park, Sunday, May 12, 2019, in Boston. (AP Photo/Steven Senne)

Red Sox: Manager Alex Cora said LHP David Price (left elbow tendinitis) threw a bullpen and “probably” will start against Houston next weekend. . Cora also said 2B Dustin Pedroia felt some minor soreness in his balky left knee and didn’t play Saturday on his minor league rehab assignment. “In his own words, he was ‘just being smart,'” Cora said. “Hopefully, it’s nothing.”

OTHER MISTAKES

Seattle 3B Tim Beckham went near the seats trying to catch a foul pop and watched the ball bounce on the dirt. It was ruled no play by the official scorer. … Boston 1B Steve Pearce booted a grounder.

Boston Red Sox's J.D. Martinez, right, celebrates his two-run home run as he arrives at home plate as Seattle Mariners catcher Omar Narvaez, left, looks on in the eighth inning of a baseball game at Fenway Park, Sunday, May 12, 2019, in Boston. (AP Photo/Steven Senne)
Boston Red Sox’s J.D. Martinez, right, celebrates his two-run home run as he arrives at home plate as Seattle Mariners catcher Omar Narvaez, left, looks on in the eighth inning of a baseball game at Fenway Park, Sunday, May 12, 2019, in Boston. (AP Photo/Steven Senne)

EXTRA WORK

The grounds crew spread drying agent around the basepaths and mound, raking the areas many times. Plate umpire Quinn Wolcott did his part by wiping the plate with a towel.

FIRST TIME OUT

Seattle Mariners' Marco Gonzales delivers a pitch against the Boston Red Sox during the first inning of a baseball game at Fenway Park, Sunday, May 12, 2019, in Boston. (AP Photo/Steven Senne)
Seattle Mariners’ Marco Gonzales delivers a pitch against the Boston Red Sox during the first inning of a baseball game at Fenway Park, Sunday, May 12, 2019, in Boston. (AP Photo/Steven Senne)

Seattle RHP Parker Markel made his major league debut, giving up two runs.

UP NEXT

Mariners: LHP Yusei Kikuchi (2-1, 3.54 ERA) is set to start the opener of a two-game series Monday at home against Oakland.

Boston Red Sox's Hector Velazquez delivers a pitch against the Seattle Mariners in the first inning of a baseball game at Fenway Park, Sunday, May 12, 2019, in Boston. (AP Photo/Steven Senne)
Boston Red Sox’s Hector Velazquez delivers a pitch against the Seattle Mariners in the first inning of a baseball game at Fenway Park, Sunday, May 12, 2019, in Boston. (AP Photo/Steven Senne)

Red Sox: Off on Monday before LHP Chris Sale (1-5, 4.50) is slated to start Tuesday versus Colorado. He fanned a season-high 14 over eight innings and allowed one run in a no-decision Wednesday at Baltimore.

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