By TOM WITHERS
AP Sports Writer
CLEVELAND (AP) — Backed up to their own goal line, the Rams buckled down.
Safety John Johnson III intercepted Baker Mayfield's fourth-down pass with 27 seconds left as Los Angeles escaped with a 20-13 win Sunday night over the short-handed Cleveland Browns, who gave the defending NFC champions all they could handle.
Cooper Kupp caught two touchdown passes from Jared Goff and the Rams (3-0) stopped Mayfield on four straight plays from the 4-yard line in the final minute.
The Rams (3-0) remained unbeaten — and perfect against AFC teams in the regular season under coach Sean McVay — by barely holding back the Browns (1-2), who were missing their entire starting secondary and still took the Rams to the final snaps.
"Unbelievable," McVay said. "It wa