SAN DIEGO _ Jhoulys Chacin hung a slider. Then he hung his head.
A drive rocketed off the bat of Nolan Arenado. The baseball touched down 428 feet away, in the second deck of Petco Park's left-field seats. As far as home runs go, this was rare territory.
The Colorado Rockies, a team Chacin once pitched for and one he had never faced, invaded his new home Saturday, turning a safe haven into the site of a blowout.
Aside from a few mistakes, Chacin gave the Padres a chance. Their bullpen did not, crumbling shortly after the starting pitcher's exit. San Diego's five-game winning streak went with it, ending in a 10-1 defeat.
Tyler Chatwood outdueled his former teammate, limiting an offense that scored eight times in Friday's series opener to a single run. It was produced with one swing, Padres catcher Austin Hedges crushing his third homer in as many starts.
In an earlier game for Chacin, that may have been enough support. During his first six big-league seasons, when he made half his starts at Colorado's Coors Field, the right-hander relished trips to Petco Park. He signed a one-year deal with the Padres in December, and immediately made himself at home.
Entering Saturday, Chacin had allowed two runs over 27 innings in downtown San Diego. In stark contrast, he had surrendered 36 runs over 302/3 innings on the road.
For three innings, a trend continued. Then Chacin's defense faltered.
In the top of the fourth, second baseman Yangervis Solarte dropped a one-out popup. Carlos Gonzalez reached on the error, advanced to second on a groundout and scored on a single by Gerardo Parra. The Rockies led, 1-0.
The top of the fifth was defined by self-inflicted damage. Chatwood sprung a surprise, lining a one-out double. DJ LeMahieu scored him with a single. Finally, Chacin threw a cement-mixer slider to Arenado.
"I was making good pitches today, especially in the first three innings," Chacin said. "In the fifth, that's when I started off with a fastball right in the middle to the pitcher. I feel I threw a pretty good pitch away to LeMahieu. He just hit it on a line.
"That pitch to Arenado, I hung it. When you hang your slider to a good hitter like Arenado, you're going to pay for it."
Hedges would launch a solo shot off the Western Metal building in the bottom of the fifth. Chacin would finish the sixth, having allowed four runs, three earned, and struck out seven. He departed with the Rockies leading, 4-1.
"I thought he was outstanding," Hedges said of Chacin. "One bad pitch to Arenado, but aside from that he was great. The slider and the sinker were working very well. They're a good team, and they're tough to pitch to."
The deficit subsequently ballooned. Miguel Diaz yielded a pair of soft singles. Jose Torres replaced Diaz and walked a batter, loading the bases. Ian Desmond cleared them, launching a grand slam to left-center.
In the eighth, LeMahieu notched another RBI single. Arenado lifted a sacrifice fly to left, providing the final margin.
The Rockies bullpen hardly stirred. Chatwood went eight innings, allowing four hits and a walk. He struck out eight.
"We're going to grow as a club," Padres manager Andy Green said. "Like, laying off that curveball in the dirt with two strikes is big for us. We chased it plenty of times, and we never really strung together a lot of good at-bats. Part of that's the guy's throwing 95-97 with a good cutter and a good curveball. (Chatwood) was on today."
