"Five hundred on the road and you take care of business at home you are going to end up in a pretty good spot," he said after the Cubs lost to the Arizona Diamondbacks 4-3 on Sunday.
Both losses in Arizona were by one run, including Friday night's series opener in 13 innings.
"We keep playing these tight ball games," Hammel said, "sooner or later they will start going our way. We continue to battle even though we are down. You really can't shake your head or get down. We played good baseball."
"At this point you get greedy," Cubs manager Joe Maddon said. "We did play better than that (3-3 on the road trip) but you accept it at this moment. Coming out west, the time change, all that stuff, day game after a night game, going back for another day game tomorrow, it is not easy."
Arizona's Paul Goldschmidt hit his second home run in three days.
His 12th home run of the season, a two-run shot to the porch in deep right-center, put Arizona up 4-1 in the third. Goldschmidt also singled in a run in the first.
Jeremy Hellickson (2-2), who played for Maddon when the two were with Tampa Bay, allowed three runs on four hits in 6 2/3 innings to get the win. He also had his first career RBI. Hellickson won for the first time at Chase Field, where 39,660 — the second-largest crowd of the season — gathered for fedora giveaway day.
Brad Ziegler pitched a scoreless ninth for his second save.
Hammel (3-2) went seven innings, allowing four runs on five hits with nine strikeouts and an intentional walk.
"A tale of two pitchers," Hammel said. "I felt good. The first three innings I just couldn't get the ball over the plate, too many pitches up in the zone. Obviously Goldy when he is locked in he is not going to swing at too much bad stuff and if you are over the plate he is probably going to hurt you."
Arizona shortstop Nick Ahmed tripled and made two outstanding defensive plays. He made a tough backhand stab to start a double play that ended the sixth, then ranged far to his left to field Jorge Soler's grounder and throw him out.
Coghlan made a spectacular grab of Ender Inciarte's sharply hit fly ball to left in the seventh.
The Diamondbacks, winners in six of their last seven, broke a 1-all tie in the third. Ahmed led off with a triple, extending his career-best hitting streak to nine games, and scored on Hellickson's sacrifice fly.
With two outs, Goldschmidt homered. He had a two-run homer to tie it in the 10th in the Diamondbacks' 5-4 win in the series opener on Friday.
"Best player in the game," Hellickson said.
Diamondbacks: RHP Bronson Arroyo, recovering from Tommy John surgery, is to throw a bullpen session on Tuesday, his first in 10 months. ... RHP Matt Stites (right elbow inflammation) is to pitch an extended spring training game Monday, then report to Class A Visalia.
Cubs: Chicago opens a three-game series at home with Washington. LHP Tsuyoshi Wada (0-0, 3.86) makes his second start since being called up from Triple-A Iowa. He struck out a career-nine against San Diego on Tuesday, allowing two runs on four hits in 4 2/3 innings. RHP Tanner Roark (0-2, 2.66) goes for the Nationals.