Colchester claimed their first away win since the opening day of the season with a 2-0 victory at Oldham.
The visitors went in front as Craig Eastmond crossed from the left and Oldham full-back Ellis Plummer slid the ball into his own net from four yards.
The lead was doubled when Dominic Vose set up Jabo Ibehre for a simple tap-in.
Oldham's John Pritchard hit the woodwork from long range and Connor Brown forced a good save as their nine-match unbeaten home run came to an end.
VIEW FROM THE DRESSING ROOM
Oldham manager Lee Johnson told BBC Radio Manchester:
"It was very poor all round. There was a lack of desire, quality and energy, and that's disappointing.
"After a good performance the other day [in the FA Cup at Mansfield] to get the spirits of the town up - to then go out and play like that was heartbreaking.
"We've got injuries to key players but that's no excuse. There's nothing you can do but crack on and hope that, in the next game, they show that energy and desire."
Oldham Athletic 01 Oxley 18 Lanzoni 26 Plummer (Brown - 45' ) 15 Winchester (Millar - 45' ) 06 Tarkowski 03 Grounds 20 Petrasso 08 Smith 09 Rooney (Pritchard - 79' ) 27 Philliskirk Booked 12 Mellor Substitutes 02 Brown 17 Rodgers 21 Millar 23 Joyce 29 Rachubka 31 Gosset 36 Pritchard Colchester United 44 Walker 20 Wilson 27 Garbutt 06 Eastmond Booked (Gilbey - 81' ) 04 Okuonghae 18 Eastman Booked 16 Turgott (Dickson - 69' ) 02 Wright 17 Ibehre (Morrison - 69' ) 25 Vose 15 Bean Substitutes 01 Cousins 03 Dickson 07 Watt 09 Morrison 14 Bond 22 Gilbey 39 Tozer
Ref: Tony Harrington