Cal duo ends up tied for second.
Defending champion Brandon Hagy tied for the lead.
Weaver joins Cal teammates Max Homa and Michael Kim on American squad.
Hagy was the final of five Golden Bears remaining in original 312-player field.
2012 finalist Michael Weaver falls in opening round of match play.
Duo back after finalist and semifinalist finishes a year ago
Brandon Hagy top Cal player in a tie for 58th after opening round
Hagy, Homa, Johnson, Kim and Weaver
Cal senior finishes as top amateur in event and 66th overall.
Cal senior tied for 54th after three rounds
Weaver misses chance for match play by a single stroke, while Hagy finishes two shots out of top 16.
Cal senior fires three-under par 68 on Friday.