Why Erisbel Arruebarrena — who can’t swing — didn’t pinch run for A.J. Ellis earlier.

Erisbel Arruebarrena

Erisbel Arruebarrena was limited to pinch-running duties Wednesday because of a shoulder injury. (Getty Images)

In the 10th inning, when A.J. Ellis drew a one-out walk in a tie game, many of you chimed in on social media wondering why Don Mattingly didn’t pinch run for the slow-footed catcher.

Mattingly did use a pinch runner eventually, when the bases were loaded with one out. Erisbel Arruebarrena took Ellis’ place at third base, and barely had to move as Adrian Gonzalez and Juan Uribe struck out.
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Paco Rodriguez set to throw simulated game Friday after strong bullpen session.

Paco Rodriguez

Paco Rodriguez has been on the disabled list since August 3 with a strained muscle near his left armpit. (John McCoy/Staff photographer)

Paco Rodriguez threw a 20-pitch bullpen session Tuesday at Dodger Stadium and couldn’t have been more pleased with the results.

Not only did he throw a perfect game, Rodriguez didn’t feel any of the usual soreness in his strained teres major muscle near his left armpit Wednesday morning.

“I feel good right now,” he said. “I was a little sore, but hopefully that’s the usual soreness.”

The pitcher said he’ll throw a simulated game Friday prior to the Dodgers’ game against the Arizona Diamondbacks.

Rodriguez had been having trouble the day after each of his previous bullpen sessions. The positive prognosis puts Paco on track to fulfill his mid-September return.

Rodriguez has a 4.35 ERA in 10 ⅓ innings (13 appearances) this season. He hasn’t pitched in a game since August 3.

Carlos Frias set to make first major-league start against Washington Nationals.

Carlos Frias is making his first major-league for the Dodgers today, opposing Washington Nationals right-hander Jordan Zimmermann (10-5, 2.93 ERA).

In a sense, it’s the antithesis of a low-pressure scenario: The rubber match of a three-game September series against the best team (by record) in the National League.

“You’re not looking at him to be Kershaw and go 8 or 9 (innings),” Dodgers manager Don Mattingly said. “I think that we’re looking for him to give us a quality start, get us through the lineup a couple times hopefully and see where we’re at.”

Frias has allowed nine runs in 14 ⅓ innings this season, all in relief, for a 5.65 ERA. Already in his brief major-league career he’s thrown six pitches (fastball, sinker, cutter, changeup, slider, curveball) and that typically plays better for a starter than a reliever.

Not coincidentally, Tim Federowicz is starting at catcher for the first time since June 12. Federowicz caught Frias so often in Triple-A Albuquerque this season, he joked that he’s practically Frias’ “personal catcher.”

“He’s been going six or seven innings every start,” Federowicz said. “I’ll get him there.”

Just a reminder: The game begins at noon on SportsNet LA and MLB Network (outside the SNLA markets).