Ian Millar came back from his near miss Friday night in the Nations Cup to give Canada its first victory in the 1977 Washington International Horse Show at Capital Centre yesterday afternoon.

The lanky Perth, Ont., rider rode Brother Sam, "my reserve horse," to a win in the Second Ringmaster Challenge Trophy event, outracing eight other would class entries in the jumpoff to win in 35.8 seconds. Conrad Homfeld of the U.S. Equestrian Team on Balbuco was second in 38.6 while another Canadian, Torchy Miller, was third in 40.0 on Eden Vale.

In the Nations Cup Friday night, it was Millar who came up with the pressure ride that tied the Americans at the end of the second round and froced the issue into a umpoff. The unprecedented jumpoff in the event, the first in its five years at the Washington show, was won by the USET by a single point.

"He's a big lanky horse," said Millar, "it's difficult for him indoors, Rings inside are not as roomy and the jumps come at you fast. But "Sam" handled it well. I did't realize he was going so fast."

The showing by the Maple Leaf team yesterday kept them in the running for the team title, with three international-open classes remaining. The Candadians have 45 points, standing in third place behind the leading United States team which has 81, and the suprising British, who have 60. The West Germans, with arelatively young and inexperienced team are far behind with 13.

Jane Womble's Henry The Hawk took a giant stride toward repeating as the show's grand hunter champion by wrapping up the Amateur-Owner championship. The 5-year-old bay gelding, showing out of Keswick, Va., clinched the tricolor with a victory in the Shari Hollis Memorial Challenge Trophy event. The win gave "Henry" a division winning total oof 12 points, two more than he reserve champion, Rain Check, owned by Martha Fruehauf.

The junior hunters and ponies began their two-day domination of the show yesterday morning with Tracey Weinberg's Escadrille andthe Ri-Arm Farm's Bridegroom winning the opening sections of the junior working hunter, attire class.

The Lacega Perpetual Trophy went to the winner f the large pony conformation hunter opening class, Gwyned Silver Seal, owned by Mr. and Mrs. Brownley Curry of Southampton, N.Y. Two major show trophies, the Farnley Nettle Challenge Trophy and the Winchester Marine Challenge Trophy, both up for grabs among the small conformation ponies, went to Miles River Moonglow of the Fox Den Farm and Farnley Colorado, owned by Sandy Lytle, respectively.