Harvard's phenomenal freshman nine exploded for five runs in the tenth inning yesterday to defeat Yale, 7-2, and wind up an undefeated season.

In the madcap finale to a Harvard freshman baseball team's first undefeated season since 1900, the Yardlings were behind all the way until the last inning. With two outs in the tenth and the score 2-2, the freshman murderers' row went to work.

Bill Kelly started it off with a walk. Dan Demichele singled, and Peter Varney followed with another single, driving in Kelly and making the score 3-2. It was the first time the Crimson had been ahead all day.

But the rally did not end there, as the Crimson scored four runs more, two on a triple by Chico Garcia.

Ominous start

The game started ominously. Nervous at the prospect of an unbeaten record, the Yardlings allowed Yale a run in the first inning. Harvard didn't catch up until the fifth on a single by Garcia. Yale quickly regained the lead, scoring in the next inning on a sacrifice fly. With defeat looming, Demichele drove in a run in the eighth to keep Harvard alive and send the game into extra innings. In the tenth the deluge came.

J. C. Nickens started and went the distance for the Crimson. With cool precision he retired the side in the last of the tenth to clinch the victory. The last two outs were strikeouts.

It was the last game for coach Steve Novick, who is leaving next year, and in the lockers the ecstatic team showered him with champagne.