The field, which started at 131 players, competed over 36 holes - 18 each at Overbrook Golf Club and Radnor Valley Country Club in Radnor Township.
Matthews, who was an alternate in last month's U.S. Open at Merion, carded 11 birdies and finished at 4-under-par 136. He started with a 67 at Overbrook, the best round of the day there.
"I've been playing a lot of golf and I thought I might be a little tired," Matthews said. "But I played great in the morning. I missed a few putts here and there, but all I wanted to do was make it. Not only did I want to get there, but I want to make it to match play. What happens from there, I'm going to make my own destiny."
Marucci shot 69 at Overbrook and 72 at Radnor Valley for 141 and appeared to be in until Dalinka, a Council Rock North graduate, birdied his 16th and 17th holes - the seventh and eighth at Radnor Valley - to tie him. In the playoff, Marucci put his tee ball into a greenside bunker and lost to Dalinka's par.
"Brookline would be special because I played there 32 years ago," said Marucci, who will be an alternate. "So it would be fun. Frankly, if you told me this morning that I'd be in a playoff for one spot, I probably would have taken it. I would have liked to hit a better shot" in the playoff.
Fahey fired a 5-under 65, a competitive course record at Radnor Valley, in the afternoon. The round featured five consecutive birdies, from the 18th through the fourth holes, on putts ranging from 15 to 50 feet.
"For some reason, I just saw all the breaks that were out there and started the putts right on line," said Fahey, who will enter Dartmouth in the fall.
Contact Joe Juliano at firstname.lastname@example.org. Follow on Twitter @JoeJulesInq.