MAZATLAN, Mexico -- Mexico is once again alone at the top.

Riding a terrific start by Jorge Campillo and more timely hitting by Miguel Flores, Mexico clinched at least a tie in the 2005 Caribbean Series with a 4-0 victory over winless Puerto Rico on Sunday. The win gave Mexico (4-1) the best record in this round-robin tournament with just one more game to play.

"Every team comes in here with the idea they want to win the Caribbean Series," Mexico manager Juan Jose Pacho said. "We are not any different. That's our goal."

A victory in Sunday night's game against the Dominican Republic would give Mexico its fifth Caribbean Series title and first since Culiacan won the 2002 Series in Venezuela. A loss would mean waiting to see what happened in Monday morning's Puerto Rico-Dominican Republic makeup game, with the possibility of a championship game looming on Monday afternoon.

The situation gets a little more confusing if Venezuela beats Puerto Rico in game No. 3 of Sunday's quadrupleheader. If that happens, followed by a Dominican victory over Mexico and then Puerto Rico on Monday, that would create a three-way tie.

Puerto Rico hasn't won a Series game since 2003 and took a 12-game losing streak into its second game against Venezuela.

Caribbean Series

"The level of play in Mexico is growing," Puerto Rico manager Mako Oliveras said. "You have a lot more players who are playing Major League Baseball. When you see guys like Vinicio Castilla and Erubiel Durazo on their team, it's a challenge."

With Venezuela's first-game loss on Sunday morning, Mexico knew it controlled its own destiny. Starting with the first inning, the Venados made sure Puerto Rico wouldn't change that.

Trenidad Hubbard led off with a single, moved to second on a ground out and stole third. He came home on a Vinny Castila grounder to give Mexico a 1-0 lead. It was the Nationals third baseman's Series-leading seventh RBI of the tournament.

Mexico added a second run in the third. Flores, now hitting .455 for the Series after going 2-for-4 Sunday afternoon, led off with a double. After Castilla walked, Durazo drove a ball deep to right that Orlando Merced kept in the park by reaching up over the wall. Flores moved to third and came home on Derrick White's sacrifice fly to make it 2-0.

The Venados made it 3-0 in the fourth. First baseman Bill Selby took the first pitch of the inning from Josue Matos and deposited into the right-field bleachers. That was the final inning of work for Matos, who gave up six hits, three runs and one walk while striking out two in his four innings of work.

Flores was at it again in the sixth, driving home Adan Amezcua to give Mexico a 4-0 lead. Heber Gomez's RBI double in the eighth inning drove in Amezcua to give the Venados a 5-0 cushion.

Campillo, who led the Mexican Pacific League in wins (10) and ERA (2.05) while playing for Culiacan during the regular Winter League season, was never in any real danger. Puerto Rico got only one runner into scoring position through Campillo's eight innings, and Andres Torres was stranded after singling and stealing second in the third. Campillo never allowed more than one runner in any inning.

"I'm working hard to make it to the Major Leagues," said Campillo, who could be going to the Detroit Tigers camp this spring. "I don't know if I am good enough yet, but that's what I dream about."

"I never had any doubt in him," Pacho said. "He was one of the best pitchers in Mexico and he demonstrated that today."

Perhaps more importantly, he helped save Mexico's bullpen from being overextended with perhaps a championship game yet to play on Sunday.