CHICAGO (AP) - No runs, no answers from Carlos Lee.

The Houston Astros are still struggling, and still waiting for an answer from their slugger, who is keeping them in limbo on whether he will accept a trade to the Los Angeles Dodgers.

The Astros have lost four straight and were swept in a three-game weekend series in Chicago, culminating with a 3-0 loss on Sunday.

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After the game, Lee said he was still undecided on whether he will accept a deal to the Dodgers. He was 1 for 4 with a double in the ninth.

``It's frustrating,' Astros manager Brad Mills said. ``When we do get opportunities we haven't been able to cash those in. And today we really didn't get any opportunities.'

J.D. Martinez got the Astros' first hit of the day against Cubs starter Travis Wood (3-3) in the fifth inning, a ground ball double down the third-base line, one of only four hits on the day.

``Right now we've got away from our plan a little bit. I feel like we're going up there and swinging at a lot of pitchers' pitches,' Martinez said. ``We're not making the pitchers come to us. It's been a struggle.'

Wood retired the first 12 batters he faced.

``That was another pretty dominating outing,' Cubs manager Dale Sveum said. ``It was impressive how he kept the ball inside as well as making all of his pitches.'

Wandy Rodriguez (6-6) matched Wood through the first five innings, allowing only two singles. Rodriguez gave up three runs on five hits, with three strikeouts and one walk in his seven innings.

It was scoreless in the sixth when Wood led off with a double against Rodriguez.

``He's actually an offensive asset when he is up there. His athleticism and things like that change a game around. It was the Travis Wood show today, no doubt about it,' Sveum said.

Reed Johnson followed with a grounder to third baseman Matt Downs, who made a sliding stop. Downs didn't look Wood back, and the pitcher took third as Johnson was thrown out.

After an intentional walk to Starlin Castro, Rizzo singled. Jeff Baker followed with a two-run double to left.

``One mistake to the pitcher. He's leading off and I think he's going to take one strike and I threw a fastball and he hit it for a double. After that I tried to put the ball down for a ground ball (Rizzo). That's my big mistake today,' said Rodriguez.

NOTES: All-Star second baseman Jose Altuve was back in the Houston lineup after missing six straight games because of a right hamstring injury. He was 1 for 4 with two strikeouts. ... INF Chris Johnson (.280, 6 HR, 34 RBI) was slated to play third base and bat fifth in the Astros lineup Sunday, but came up lame in batting practice with a pulled back left lat. He is day-to-day.