PORTLAND – Casey Carroll, 32, of Dover, N.H., made a successful marathon debut Sunday, beating a field of 650 runners in the 12th annual Sportshoe Center Maine Marathon.

Carroll’s time of 2 hours, 39 minutes and 18 seconds was the slowest winning time in race history, but it was good enough to beat runner-up Robert Ashby of Brunswick (2:41:29) by more than two minutes.

Vincent Connelly, 40, of Brookline, Mass., took third overall and was the first master in 2:44.09.

In the women’s division, Alison Wade of Northampton, Mass., won by nearly three minutes, finishing in 3:09:45. Kristen Jett of Coppell, Texas, placed second in 3:12:31, followed by Jill Storey of Cumberland (3:14:49).

It was a good day for masters runners in the half marathon, which had a record field of 1,087 finishers. Michael Payson, 40, of Falmouth was the overall winner in 1:11:03, nearly four minutes faster than runner-up Derek Dorval of Amesbury, Mass.

Meanwhile, Joan Benoit Samuelson of Freeport was unchallenged in the women’s half marathon, as she set a new record for the 3-year-old course. Samuelson, 46, posted a time of 1:18:44, shattering the old mark of 1:20:59 established last year by Jenna Richardson.

Keri Gathen of Albany, N.Y., finished well back in second place (1:24:56).