SAN DIEGO -- Facing a left-hander making his Major League debut, the Padres were unable to secure their first series sweep of the season.
San Diego (11-21) relinquished a two-run lead and allowed four runs in the sixth inning of a 6-2 loss to the Rockies on Wednesday afternoon at Petco Park.
In his first Major League start, Colorado's Christian Friedrich struck out seven, walked one and allowed two runs (one earned) to earn the victory. The Rockies avoided a three-game sweep and snapped their losing streak at five.
"He had a good fastball," Padres first baseman Yonder Alonso said. "He definitely showed that fastball early in the game and had a good slider. He was a guy that was pounding the zone. [We] just couldn't put those big hits together."
The Rockies (13-17) scored four times against right-hander Anthony Bass in the sixth to take a 5-2 lead. All of the runs were unearned, however, because of a one-out error by shortstop Andy Parrino. Bass allowed four hits, a sacrifice fly and an intentional walk in the inning.
"That one inning, it seemed everything I threw they were hitting," said Bass, who dropped to 1-4.
With Jonathan Herrera, who reached on Parrino's error, on third after Carlos Gonzalez's double, Michael Cuddyer's sacrifice fly tied the game at 2. After an intentional walk to Jason Giambi, Bass allowed three consecutive hits.
The big blow was Wilin Rosario's two-run double on a slider.
"[I] make a pitch down and away to him, it's a different story," Bass said. "It seemed like that was the story that inning. Moving forward, [I've] got to eliminate the big inning."
The umpires reviewed and upheld Rosario's double, which hit the top of the left-field wall. It was the second Rockies hit reviewed by the umpires -- they also reviewed and upheld Giambi's RBI double in the fourth inning that hit off the top of the right-center-field fence and cut the Padres' lead to 2-1.
Up by a pair after Rosario's double, the Rockies tacked on their final run of the sixth run on Chris Nelson's RBI single.
Bass allowed five runs (one earned) in 5 2/3 innings. He struck out four, issued an intentional walk and gave up nine hits.
Padres manager Bud Black liked Bass' progress.
"He's mixing pitches. Earlier and even last year, you saw a lot of fastball around the zone, erratic," Black said. "But now, he's pitching, which is great to see."
Alonso's double, which scored Cameron Maybin, gave the Padres a 2-0 lead in the third. The run was also unearned due to shortstop Marco Scutaro's error earlier in the inning. San Diego missed a chance to add more when Chase Headley was thrown out at the plate from left field after Gonzalez faked to second base.
The Padres took a 1-0 lead in the first. Chris Denorfia led off with a single, moved to second on a bunt and scored on Jesus Guzman's two-out single.
The Padres stranded eight baserunners and were 2-for-10 with runners in scoring position.
After allowing two runs in the first three innings, Friedrich threw three scoreless innings while filling in for the injured Jeremy Guthrie.
"That was really refreshing to see," Rockies manager Jim Tracy said. "I tip my cap to Christian Friedrich, knowing the work he's put in."
"What showed me something was he really picked it up when we took the lead," Tracy added. "The one inning when we got the runs, he had been in the dugout for a while. He walked right out there and kept firing strikes, quality strikes."
Sarah Trotto is a contributor to MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.