Matzek (elbow) played catch Saturday, David O'Brien of The Athletic reports.
Matzek underwent Tommy John surgery in October and has reportedly been throwing since the end of May. The 32-year-old reliever still has a long way to go in his rehab process and almost certainly won't be ready to return until next season, but it's a good sign to see Matzek get back to throwing with a bit of velocity.