It will be up to lower-seeded players to pull the upset today in the semifinals of the Wendy's National Senior Men's Indoor Tennis Championships at the Canyon Racquet Club.

In all cases Saturday, top-seeded players won in both the men's 45s and 55s. But that's not to say there won't be some upsets.In the men's 45, No. 1-seeded Keith Diepraam of Texas had the toughest time advancing, needing the full three sets and a tie breaker to beat No. 7-seeded Bob Stock of Florida, 7-6 (13-11), 4-6, 6-4.

Diepraam will meet little-known Rich Anderson of Southern California. Anderson, making his first appearance in a national, upset Bountiful's Clark Robinson on Friday, then No. 6-seeded Gordon Smith, also of California, 6-2, 6-1.

In the other bracket, No. 2-seeded Dick Johnson of Missouri easily beat Geoffrey Grant of California, 6-2, 6-0. He will face another new face, Joseph Rush of Seattle, Wash. Although unranked in the nationals, he is the top-ranked player in the teaching pro 40 class.

In the 55 singles, No. 1-seeded John Powless of Wisconsin beat No. 6 John Sahratian of Southern California, 7-5, 6-2, and No. 2-seeded Chuck Devoe of Indiana beat Dale Miller, a former Utahn, 6-4, 3-6, 6-2.

Also making the finals were No. 5-seeded Ken Sinclair of Canada and No. 4-seeded Mel Lewis of South Carolina.

Semifinals will begin at 9:30 a.m. at the Canyon Racquet Club. Finals will be Monday and will also begin at 9:30 a.m.