CHICAGO (AP) – Chris Snyder hit two of Arizona’s season-high five homers, including his first career grand slam, and drove in five runs as the Diamondbacks beat the Chicago Cubs 13-6 Sunday.

Luis Gonzalez added a pair of solo homers and an RBI double for the Diamondbacks, who knocked out Greg Maddux by scoring nine runs in the fourth and fifth innings and matched their highest-scoring game of the season.

Brandon Webb (9-8) limited the Cubs to two runs and three hits in seven innings. Chicago scored just 17 runs while going 3-4 on its homestand and made a move to improve its offense at the trading deadline, acquiring outfielder Matt Lawton from the Pittsburgh Pirates for outfielder Jody Gerut.

Maddux (8-8), who got his 3,000th strikeout in his last start, allowed just two baserunners before running into trouble in the fourth.

Gonzalez led off the inning with a homer onto Sheffield Ave. Tony Clark and Troy Glaus both singled and scored on Shawn Green’s double to deep center – with Glaus almost passing the slow-footed Clark going for home. Webb then came through with a two-out RBI single to left, scoring Green to make it 4-0.

Maddux left after allowing consecutive doubles to Chad Tracy and Gonzalez to start the fifth. Mike Remlinger entered and struck out two, but also walked two to load the bases for Snyder’s homer to left, extending the Cubs’ lead to 9-1.

Maddux gave up six runs and eight hits in his four-plus innings, throwing 68 pitches. The Cubs have lost his last three starts and he has lost his last two decisions.

Arizona hit three more homers off Sergio Mitre. Gonzalez added a solo shot in the sixth and Snyder’s fifth home run came in the seventh. Clark hit his 17th homer of the season in the eighth, a two-run shot.

Webb walked two and struck out four. He had lost his last six decisions since beating the San Francisco Giants on June 23.

Todd Walker singled and scored on Aramis Ramirez’s sacrifice fly in the fourth and Michael Barrett tripled and scored on Jerry Hairston’s groundout in the fifth. Walker and Derrek Lee added RBI singles in the four-run eighth.

Notes: Maddux got a standing ovation at the end of the second inning when he dove to field Royce Clayton’s bunt near first base, flipping it to Lee for the third out as he landed on the ground. … Chicago also scored 13 runs on June 26 against Detroit. … Arizona manager Bob Melvin batted Clark fourth and Glaus fifth. Glaus had hit fourth 93 times this season, Clark just three. … It was Snyder’s second career two-homer game, his first this season. … The Cubs hadn’t lost a series since dropping two in a row to Washington and Atlanta in the midst of an eight-game losing streak from July 1-7. … Gerut started the game in left, going 0-for-2 to drop his average with the Cubs to .071 (1-for-14) before getting pulled for Todd Hollandsworth. … The Cubs had an announced crowd of 39,285 to bring them over the 2 million mark, at 2,023,322 in 52 games.

AP-ES-07-31-05 1732EDT