San Juan, Puerto Rico ? A trip to the Montreal Expos’ favorite island caused a shipwreck for the New York Mets.

More errors. More injuries.

The bottom line: Swept away.

“Maybe it’s just Puerto Rico. Maybe we have to get out of Puerto Rico,” Mets manager Art Howe said Monday night after his team’s latest loss, a deflating 5-3 defeat against Montreal that completed a four-game sweep.

“There’s no logic to it. It’s something different every night. Maybe a change of scenery will solve the problem.”

New York clawed back from a 3-0 deficit to tie the game, but Fernando Tatis hit an opposite-field, two-run single in the eighth inning off David Weathers after Mike Stanton joined the injury list.

Rey Sanchez, one of the Puerto Rican stars getting to play major-league ball in their home country, set up the winning rally when he misplayed Vladimir Guerrero’s one-out grounder to shortstop for an error.

“We’ll battle through it. We’ll be better,” Weathers said. “Last year we started 18-11, everybody thought we were going to take off and we went in the tank.”

The NL East-leading Expos (9-4), who play 22 of their home games in San Juan, extended their winning streak to five. They made New York’s island visit a wipeout, outscoring the last-place Mets 22-8.

“This was pretty sweet,” Montreal manager Frank Robinson said. “I’m very proud of this team. We understand and appreciate what went on here tonight.”

New York (4-9) lost its sixth straight and dropped five games back, its season veering off course just two weeks in. The Mets, who have scored only 38 runs this season, hadn’t been swept by the Expos in a four-game series since September 1972.

Los Expos dispatched New York like rude tourists. Stanton strained a calf muscle, joining Cliff Floyd (Achilles’ tendon) and Mo Vaughn (sore knee) on the injured list. Mike Piazza, trying desperately to beat out a hit, tumbled over first base in the sixth inning.

“A couple of bruises, but I’m all right,” Piazza said.

Howe was worried at first, saying: “That looked like it could have been a separated shoulder.” Right now, the Mets are trying to sprint from home to first in two seconds.

“How can you criticize anybody who’s playing so hard for you?” he said.

Phillies 5, Marlins 2

Philadelphia — Jim Thome hit a two-run triple, and the Philadelphia bullpen made it stand up against Florida. The Phillies have won three straight and five of seven. Florida lost its second in a row after winning four straight.

Reds 11, Cubs 3

Chicago — Jason LaRue doubled three times, and Sean Casey had three hits as Cincinnati beat Mark Prior and Chicago. Jose Guillen hit a two-run homer, while Casey and Felipe Lopez each drove in two runs. It was an encouraging victory for the Reds, who placed All-Star shortstop Barry Larkin on the 15-day disabled list because of a strained left calf earlier in the day.

Cardinals 7, Brewers 5

Milwaukee — Orlando Palmeiro homered and tied a career high with four RBIs as St. Louis kept Milwaukee winless at home. Brett Tomko (1-1) survived a shaky start to send the Brewers to an 0-4 mark at Miller Park, and 0-4 against the Cardinals. Cardinals slugger Albert Pujols left after being hit on his right thumb by a fastball from Curtis Leskanic in the seventh.

Rockies 5, Diamondbacks 3

Phoenix — Larry Walker drove in four runs with his first two homers of the season, and Nelson Cruz became the fourth Colorado pitcher to win three games in April.

Giants 4, Astros 2

San Francisco — Barry Bonds homered, and the Giants spoiled Jeff Kent’s return to San Francisco. The Giants improved to 12-1, keeping pace with their best start in 65 years. Kent, the 2000 NL MVP who played the previous six years in San Francisco, went 1-for-2 with two walks and an RBI. He signed an $18.2 million, two-year contract in the offseason with the Astros.