CHICAGO -- The Cubs have soared to the top of the major leagues with little help from Jason Heyward in his first season in Chicago.If their $184 million man can start delivering like he did Sunday, look out.Heyward tied it with a single in the ninth inning and his liner to left-center in the 13th won it as the Cubs beat the San Francisco Giants 3-2 on Sunday to take three of four games in a possible playoff preview.Its huge because we have a good team, Heyward said of his recent uptick, and when you add that to it, it just makes us that much better.Anthony Rizzo led off the 13th with a single off Matt Reynolds (0-1) and went to second on Ben Zobrists groundout. Addison Russell, who had three hits, was walked intentionally before Heyward drove in his third run of the game.Heyward left St. Louis in the offseason for a big-money deal with the Cubs, but he was hitting. 225 when manager Joe Maddon benched him for four games last month.I really believe when a very good major league player may be struggling, if he just sits and watches a major league game being played and then understands, `Im one of the best, it does something internally, Maddon said.Heyward has five multihit games in his last eight starts.Just being more consistent with timing, with better swings, swinging at better pitches, Heyward said.Trevor Cahill (4-4) worked a perfect inning in a series in which all four games were decided by one run.The Cubs maintained a 16 1/2-game lead in the NL Central, while the Giants lead over the Cardinals for the first wild card was reduced to 1 1/2 games.The Cubs were staring at a second straight loss when Russell led off the ninth with a double against Santiago Casilla. He went to third on a wild pitch and scored on Heywards single up the middle to hand Casilla his NL-high seventh blown save.The Giants appeared on their way to the win in regulation despite managing two hits thanks to seven innings of five-hit ball from Johnny Cueto and a perfectly executed suicide squeeze.Eduardo Nunez doubled in the fifth, stole third then broke for home as Ehire Adrianza put down a soft bunt in front of the mound that forced John Lackey to throw to first and snapped a 1-all tie.In his first start since Aug. 14 because of a shoulder strain, Lackey allowed one earned run and one hit in five innings.Heyward made up for a two-base error in the second when he couldnt make a running catch of Hunter Pences fly to right-center. Pence scored the unearned run on Nunezs groundout.After the Cubs tied it when Haywards bloop single scored Anthony Rizzo in the fourth, the Giants got their first hit an inning later on Nunezs one-out liner to the gap.The Giants mustered 14 hits in the four games, failing to score in 16 innings against Chicagos bullpen.To go against a staff like this youd figure they were going to be low-scoring games. Its tough to come away with three losses, manager Bruce Bochy said. They played well. We just didnt do a lot of hitting.TRAINERS ROOMGiants: Bochy didnt start SS Brandon Crawford and LF Angel Pagan with a day game Monday at Colorado. Both ended up pinch-hitting.Cubs: Setup man Hector Rondon (triceps) could come off the disabled list as soon as Monday.RIZZO RECOVERSMaddon pointed out Rizzo took off immediately to score on Heywards liner a day after a baserunning blunder in the ninth inning of a 3-2 loss.SCARY MOMENTGiants 1B Brandon Belt, who has had multiple concussions, stayed in after taking Rob Zastryznys 87 mph fastball of his helmet in the seventh.NATHAN DEBUTRHP Joe Nathan making his first appearance with San Francisco since the 2003 playoffs, struck out Kris Bryant in a perfect 12th.SIXTH MANChicago will stick with a six starters through another turn in the rotation, with LHP Mike Montgomery getting the ball Wednesday at Milwaukee.UP NEXTGiants: LHP Matt Moore (9-10, 3.88 ERA) flew early to Denver and starts Monday against Rockies RHP Chad Bettis (11-7, 5.17).Cubs: RHP Kyle Hendricks (13-7) carries the majors lowest ERA of 2.09 into Mondays start at Milwaukee against RHP Zach Davies (10-6, 4.07).Andre Tippett Jersey . 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Julian Edelman Patriots Jersey . Perez, 35, posted a 1-2 record with a 3.69 earned-run average in 19 relief appearances last season. His season ended Aug. 9 due to a torn ligament in his left elbow. Perez joins infielder Andy LaRoche and catcher Mike Nickeas with minor-league agreements for 2014 that include invitations to attend spring training.DENVER -- Socrates Brito snapped a seventh-inning tie with a three-run homer, and the Arizona Diamondbacks held off a late rally to beat the Colorado Rockies 8-5 on Sunday.Archie Bradley scattered six hits over six innings and Jean Segura had three hits in his return to the lineup for Arizona.Bradley (6-8) struck out six but it appeared he might be the hard-luck loser. Rockies starter Jon Gray (9-7) had allowed a run in thee first inning on a sacrifice fly but retired 17 of 19 batters before Arizona roughed him up in the seventh.ddddddddddddTrailing 2-1, the Diamondbacks tied it with three straight one-out singles. Brito made it 5-2 when he hit Grays first-pitch fastball into the second deck in right-center field. ' ' '