Looking to reverse their slow start to the season, the Marlins unleashed every bit of their offensive star power Monday at Citi Field, parlaying a seven-run second inning into a 10-3 drubbing of the Mets.

Astros slugger Evan Gattis, who last year led the club in triples (11), homers (25) and RBIs (88), was activated from the disabled list following Houston’s 8-2 win over the Royals on Monday night. He will rejoin the club for Game 2 of the series on Tuesday. Infielder Matt Duffy was optioned to Triple-A Fresno to make room.

Daniel Murphy keeps hitting like it’s October 2015. The second baseman — who briefly turned into Babe Ruth during last year’s postseason — collected two hits including a home run in Monday’s 6-4 Nationals win to raise his batting average on the season to .471 (8-for-17).

This season’s final home opener is set for Monday as the Dodgers return to Los Angeles to host the Diamondbacks. This National League West clash is just one of many intriguing contests on tap for Monday. Here’s a few things to watch for throughout the day.

Collin McHugh bounced back from a woeful 2016 debut with seven scoreless innings and Colby Rasmus walloped his third homer of the season to lead the Astros to an 8-2 win over the Royals on Monday, Opening Day at Minute Maid Park.

To say that Steven Matz never faced adversity before Monday’s 10-3 loss to the Marlins would be false.

Are you surprised?

Under the circumstances, Barry Bonds doesn’t believe Alex Rodriguez will “have the time” to overtake him and go into first place on the all-time home run list.

With starters Brett Anderson, Brandon McCarthy and Hyun-Jin Ryu beginning the year on the disabled list, the Dodgers surely liked what they saw from Julio Urias on Monday is his season debut for Triple-A Oklahoma City.

The top of the batting order set the tone, but almost everybody got involved. The Astros’ offense clicked beautifully on Monday night at Minute Maid Park, setting season highs in hits (14) and runs in an 8-2 win over the Royals.

Chris Davis crushed a three-run homer with two outs in the top of the ninth to lift the undefeated Orioles to a 9-7 victory over the Red Sox in Monday’s home opener at Fenway Park.

From Opening Day through the All-Star Game in San Diego through the final pitch of the 112th World Series, it’s time again for MLB.TV.

The Twins’ early-season slide continued in their sold-out home opener, as Jose Quintana tossed six strong innings and Austin Jackson had two RBIs to lift the White Sox to a 4-1 win that dropped Minnesota’s record to 0-7.

The Padres squeezed and replayed their way to a 4-3 victory over the Phillies on Monday afternoon at Citizens Bank Park, spoiling Philadelphia’s home opener.

David Ortiz’s final home opener as an active player at Fenway Park became an unforgettable event for the slugger before the game even started.

A Cardinals offense that broke out for 31 runs during a weekend series sweep returned home on Monday and battered Brewers pitching with a barrage of extra-base hits. There were 10 in total, sending the Cardinals to a 10-1 victory that extended the home opener festivities well beyond the scheduled pregame ceremonies.

Felix Dubront, who was penciled in as the club’s No. 5 starter, will undergo ulnar collateral ligament reconstruction on his left elbow Tuesday in Cincinnati. Dr. Timothy Kremchek will perform the surgery at Beacon Orthopedics.