Dexter Green, the 172-pound Iowa State hotshot out of Gar-Field H.S., started his senior Cyclone campaign as cover pic on the NCAA Football Guide, made UPI backfield of opening week with his 165 yards rushing, three TDs - and moved past Gale Sayers, John Riggins into eighth place in Big Eight career ground yardage . . . Jeff Komlo of College Park (ex-De Matha) made ECAC Division II player of week starting his collegiate curtain call by completing 15 of 20 passes for 218 yards, two scores in quarterbacking Delaware past Rhode Island, 37-0 . . . In Division III, Towson St. soph receiver Ken Snoots of New Carrollton honored by ECAC for school-record 10 catches (157 yards) in 37-6 rount of Mansfield State . . . And back to N.C Central-Virgina Union NCC started freshman William Marbury of Anacostia at QB and he rewarded 'em with 227 yards, three I'Ds passing.

Hockey's Caps officially open the downtown branch office at 919 19th St. NW at 10 a.m. tomorrow by breaking out big guns Guy Charron and Robert Picard, new Swedish skates Rolf Edberg and Leif Svensson, et al. to meet prospective customers. It's first of celebrity showings there also featuring a Sept. 25 date for Joe Theismann.

American Heart Association benefit this Saturday, Sunday at Courts Royal clubs: Racqetball Weekend, $5 contribution good for group lesson, playing time, films, shots at prizes 10 a.m.-6 p.m.

[WORD ILLEGIBLE] Collins, Eddie Fowler, HF Sandler, Juanita Richardson, Bob Williams will be the 1978 inductees into the Greater Washington Softball Hall of Fame come Friday, Sept. 22 dinner-dance at Christ the King Parish Hall in Silver Spring.