BALTIMORE (AP) _ Former Baltimore Colts quarterback Johnny Unitas underwent coronary bypass surgery Saturday at the University of Maryland Medical Center.

The surgery went well and the NFL Hall of Fame quarterback was resting comfortably afterward. Doctors expect Unitas to make a full recovery, his family said in a statement.

Unitas was listed in serious condition following the surgery, which is not unusual following heart surgery, officials said. He remained in serious condition Saturday evening, said Linda Anderson, a hospital spokeswoman.

Unitas, 60, was treated for chest pains after undergoing knee surgery Friday at James Lawrence Kernan Hospital$

The former Colts great experienced chest pains and had an abnormal electrocardiogram following knee surgery. He was transferred to the University of Maryland Medical Center.

Unitas, who played in college at Louisville, was selected in the fifth round of the 1955 draft by Pittsburgh then cut. He was signed by Baltimore off the sandlots, and played from 1956 to 1973 with the Colts.

He led the Colts to an overtime victory over the New York Giants in the 1958 NFL title game, a game considered one of the great games in NFL history.

He was traded to the San Diego Chargers in 1973 and retired that year having thrown for 40,239 yards, then the most in history. He still ranks second in career passing yardage to Fran Tarkenton.