“In a perfect world, we’d like to get more three-and-outs, and we’d like to dominate field position a little more with our defense,” Murphy said, “But the bottom line is we gave up no touchdowns, so that’s a great day.”

That field goal was sandwiched by Casten’s first two touchdowns. His first came less than three minutes into the game on a two-yard push. A 22-yard scamper gave him his second eight minutes later.

Casten completed the hat trick with 55 seconds left in the first half on a six-yard run up the middle as the Crimson’s offensive line opened up another big hole for him.

“Those guys make my job easy,” said Casten of the offensive line. “They were mashing people all day.”

The senior’s fourth score came late in the third quarter from three yards out. Each of Harvard’s scoring drives took less than four minutes as the Crimson used pace to overpower a Georgetown defense that had not given up more than 23 points in a game this season before Saturday.

Harvard continued moving the ball in the fourth quarter after junior quarterback Jimmy Meyer and sophomore running back Blade Brady came in, possessing the ball for most of the fourth period.

With the victory, the Crimson increased its non-conference winning streak to 10 games dating back to 2011.

—Staff writer Jacob D. H. Feldman can be reached at jacob.feldman@thecrimson.com.Follow him on Twitter @jacobfeldman4.