ARLINGTON, Texas — Tony Romo's season might be over, and the Cowboys' season might as well be.
Romo broke his left collarbone in the second quarter Monday night, then his teammates let a 13-point lead turn into a 41-35 loss to the Giants.
The Giants won their fourth straight and moved a full game ahead in the NFC East. Dallas slumped to 1-5, its worst start since 1989.
Romo was drilled by blitzing linebacker Michael Boley in the second quarter. Recovery time is generally eight to 10 weeks and, by then, there might not be any reason to rush back.
Romo was 5-of-7 for 39 yards.
"It's a shame," Dallas coach Wade Phillips said. "Tony looked like he was really sharp."
The Cowboys led 10-7 when Romo left; they stretched it to 20-7. Then New York scored on its next five possessions.
Dallas backup Jon Kitna hadn't played since Oct. 5, 2008.
His first and third passes were tipped. The next time he dropped back, he was sacked. The Giants took advantage to score the go-ahead touchdown.