CHICAGO -- The Chicago Cubs count on big games from Kris Bryant but Thursday's performance went far beyond typical expectations.

The third baseman went 5-for-5 with two home runs, five RBIs and four runs scored to help secure a four-game sweep with a 9-6 victory over the Milwaukee Brewers.

"To see him do what he's continued to do and do what he did today is not a big surprise," said Cubs starter Jake Arrieta, who improved to 15-5. "He's a pretty special guy."

Bryant became the first Cub since Mark DeRosa in 2007 with two five-hit games in a season while tying career highs in hits and run scored.

"It was one of those days that kind of went by too quick," said Bryant, who has 30 home runs to tie Colorado's Nolan Arenado for the National League lead. "You really have to enjoy a 5-for-5 day, they don't happen too much. It was a fun day to hit, that's for sure."

Chicago (77-43) won its fourth straight and 18th in 21 games. Milwaukee (52-68) has lost four in a row and six of its last seven.

Arrieta gave up five runs on three hits, walked seven and struck out three in a 5 2/3-inning effort. He matched Washington's Stephen Strasburg for most wins in the National League.

Aroldis Chapman allowed one hit in a scoreless ninth for his seventh save with the Cubs and 27th of the season.

Brewers starter Zach Davies (9-6) suffered his second straight loss after allowing seven runs in a four-inning outing.

"It's a difficult lineup on a tough day to pitch," said Brewers manager Craig Counsell. "He left some fastballs just more up today and caught more of the plate than he normally does. They put the ball in the air against him and did a good job."

The Cubs collected two runs in the first, continuing a streak of scoring first in every game in the series.

Ben Zobrist's fielder's choice grounder to first scored Bryant from third for a 1-0 lead. Anthony Rizzo, who reached on a double, moved to third and came home on Addison Russell's single to left center.

Bryant made it 4-0 in the third with a first-pitch home run to left. The two-run shot drove in Matt Szczur, who reached on a single to center.

Chicago put two more runners on for Willson Contreras, who sent a two-out single to right to drive in Zobrist for a 5-0 lead.

Arrieta retired the first eight batters he faced and didn't allow a hit until the fourth when he gave up a three-run homer to Kirk Nieuwenhuis with two out. Hernan Perez and Chris Carter scored after each walked as the Brewers trimmed the Cubs lead to 5-3.

"You could see from the first three innings I was able to pound the strike zone with pretty much everything and make them put the ball in play," Arrieta said. "I got away from it a little bit after that point."

Three consecutive doubles in the fourth led to two more Chicago runs and a 7-3 lead as Bryant drove in Szczur with a two-base hit to left and came home on Rizzo's double into the right-field corner.

Davies was lifted for a pinch hitter in the fifth. He allowed seven runs on 10 hits -- both career highs -- while striking out four and walking one.

Milwaukee put runners on second and third with two out in the fifth before Arrieta got Ryan Braun to ground out to short. But the Cubs' starter gave up a solo home run to Perez to open the sixth inning and walked two batters before leaving the game with two out.

Reliever Spencer Patton walked Keon Broxton to load the bases and issued a base on balls to Jonathan Villar to bring home Carter and cut the deficit to 7-5. Scooter Gennett grounded to second to finally end the inning.

Bryant clubbed his second homer of the day -- his 30th of the season -- with one out and the bases empty in the sixth for an 8-5 lead. Milwaukee picked up a seventh-inning run on Ramon Flores' fielder's choice grounder to first to score Nieuwenhuis.

Bryant's RBI single in the eighth drove in Javier Baez for the ninth run.

Chicago pounded out 14 hits while Milwaukee had six and walked 10 times.

"It was a good day to be a hitter, the wind was blowing out," Counsell said. "We did a good job against Arrieta ... but we couldn't slow down the top of their lineup."

NOTES: Brewers LF Ryan Braun returned to the starting lineup after sitting out Wednesday following a collision along the left-field wall that resulted in a banged up knee while chasing a fly ball on Tuesday. ... He came into the game with a career .348 batting average at Wrigley Field. ... Milwaukee travels to Seattle to open a three-game series but had not yet named a starting pitcher on Thursday. Manager Craig Counsell said Chase Anderson, sidelined by a line drive in the first inning on Tuesday, might be well enough to start. ... The Mariners will send LHP Wade LeBlanc (2-0, 4.68 ERA) against the Brewers. ... Chicago and Milwaukee meet again for a three-game series at Miller Park on Sept. 5-7. ... The Cubs hit the road Friday to open a three-game weekend series at Colorado, part of a nine games in 10 days road run that also takes them to San Diego and the Los Angeles Dodgers. ... RHP Kyle Hendricks (11-7, 2.19 ERA) takes the mound in game one against Rockies LHP Tyler Anderson (4-4, 3.42).