Nolan Arenado rounds the bases after his two-run homer Sunday during the Cardinals’ 9-1 win over the Red Sox at Fenway Park. Michael Dwyer/Associated Press

BOSTON — Nolan Arenado and Andrew Knizner each hit a two-run homer, and the St. Louis Cardinals beat the Boston Red Sox 9-1 on Sunday night to complete a three-game sweep.

Paul DeJong added a solo shot and Arenado drove in four runs for the Cardinals, who won for the sixth time in seven games since an eight-game losing streak. Their previous two wins came on ninth-inning rallies against closer Kenley Jansen.

Lars Nootbaar had three hits and scored three times for St. Louis, and Paul Goldschmidt added two hits and an RBI. Miles Mikolas (2-1) pitched six innings of one-run ball, allowing four hits with two walks.

Rafael Devers had an RBI single for Boston, which lost for the fifth time in six games.

It was the first series sweep this season for St. Louis (16-25), which owns the NL’s worst record. Arenado homered over the Green Monster once in each game of the series.

Red Sox starter Corey Kluber (2-5) gave up five runs on seven hits – two homers – with three walks and five strikeouts.

DeJong’s shot into the center-field seats broke a 1-all tie in the second. Knizner’s drive came in the fourth, also going out to center.

Boston’s Enmanuel Valdez had a two-run homer overturned by review in the seventh on a drive that replays showed hooked foul just short of Pesky’s Pole.

Génesis Cabrera escaped a bases-loaded jam in the seventh, getting Masataka Yoshida to fly out to end the inning.

DAD KNOWS

Standing on the field about two hours before the game, Red Sox pitcher Chris Sale asked how the Boston Celtics were doing in Game 7 of their NBA playoff series against Philadelphia. When informed All-Star forward Jayson Tatum had 25 points at halftime, the lefty said: “He’s my oldest son’s favorite athlete. He says it’s me, but I think that’s just to make me feel good. He has two of his jerseys and only one of mine.”

BACK INTO IT

Cardinals catcher Willson Contreras was stretching and squatting with a catcher’s mitt in the clubhouse before the game. After a break from catching, Contreras is slated to be back behind the plate Monday against Milwaukee. He was moved to DH on May 5.