Kevin Gallen scored twice as 10-man Luton came from 2-0 down to win a seven-goal thriller at Cambridge.
Luton already trailed to Courtney Pitt's 18-yard strike and a Chris Holroyd penalty when Liam Hatch was sent off for a foul on Paul Carden.
But Gallen pulled one back from close range and teed up Rossi Jarvis to equalise before Jake Howells fired the visitors ahead a minute later.
Holroyd pulled the U's level from close range but Gallen won it from the spot.
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Cambridge Utd:
Potter, Gleeson, Saah, Hatswell, Tonkin, Willmott (Crow 75), Reason, Carden, Pitt (Ives 76), Beesley (Phillips 75), Holroyd. Subs Not Used: Coulson, Parkinson.
Booked: Saah.
Goals: Pitt 20, Holroyd 33 pen, 65.
Luton: Tyler, Gnakpa (Reynolds 52), White, Pilkington, Murray, Newton, Jarvis, Hall, Howells (Blackett 63), Gallen (Craddock 81), Hatch. Subs Not Used: Gore, Charles.
Sent Off: Hatch (43).
Booked: Gnakpa, Hatch.
Goals: Gallen 48, Jarvis 60, Howells 61, Gallen 75 pen.
Att: 4,870.
Ref: R Madley (Ossett).
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