Coming back to the Majors after Tommy John surgery knocked him out of the 2008 season, Chen made his Royals debut in Pittsburgh on July 27, 2009.
In that game, Chen gave up four runs on seven hits in 6 1/3 innings for the loss. That was the last of his three starts and four appearances at PNC Park, where he's still winless at 0-3.
"I remember we wore throwback uniforms and I like to pitch in those uniforms," Chen recalled. "I lost, I was pitching well and [Delwyn Young] hit a three-run home run."
On Sunday against the Pirates, Chen will get the chance to tally his first win at PNC Park.
Meanwhile, A.J. Burnett will be on the hill for the Bucs, looking to give Pittsburgh its third Interleague sweep in team history.
Consistent all season, the right-hander has given up three runs or less in eight of his nine starts this season.
Burnett notched his fourth straight win on Tuesday against the Reds, allowing just three runs on five hits. However, an elevated pitch count forced him out of the game after five innings.
"I was able to find my curveball later on," Burnett said after the start. "I used a lot of my pitches early on."
Royals: Paulino lands on the DL
The Royals placed starter Felipe Paulino on the 15-day disabled list on Saturday and recalled right-hander Nate Adcock from Triple-A Omaha.
Paulino had to leave last Wednesday night's game against the Twins with a strained right groin.
"We wanted to give him a couple days to see if he could get better," manager Ned Yost said. "He wouldn't make his next start, and it would be doubtful if he could make the start after that."
The move marks the fourth time this season that Adcock has been summoned from Omaha, where he's gone 3-2 with a 1.99 ERA in five starts.
Pirates: Lincoln to stay in rotation mix
With Jeff Karsten experiencing another setback, Brad Lincoln will remain the Pirates' rotation for at least two more starts.
Karstens was on target to be activated to lead off the Pirates' Interleague series on Tuesday in Baltimore, until tweaking his right groin muscle at the end of his Thursday rehab outing with Indianapolis.
An MRI taken on Friday traced Karstens' discomfort to the hip flexor. Still, Karstens will be limited to some flat-ground tossing for about a week before "getting him back on the mound when he's comfortable with the leg," manager Clint Hurdle said.
After going four games without a home run, the Pirates have gone deep in four of their last seven games, hitting a total of nine in that time.
Since moving back to the leadoff spot on May 27, Royals left fielder Alex Gordon is hitting .295 (13-for-44) with six doubles.