He starred at John F. Kennedy Catholic High School, in Somers, N.Y., where he played four seasons on varsity.

He averaged 30.9 points, 7.6 assists, and 6.5 rebounds per game his senior year, and was named Westchester County Mr. Basketball.

He was an all-star at the prestigious ABCD Camp, and he was ranked as a consensus Top 100 national player in the class of 2002.

After being highly recruited, he decided to accept a scholarship to Providence College, to play in the Big East Conference.

McGrath launched his college basketball career at Providence, by being named to the Big East all-rookie team.

McGrath led the Friars in scoring (career-high average of 15.1 points per game), and 3-pointers (77) in his senior year (2005–06).

His 9-of-9 performance on 3-pointers was an NCAA Division I record for most 3-point field goals made in a game, without a miss, at that time.

After a successful year with Cantù, he played the 2007–08 season with the renowned Virtus Bologna, also of the LBA Italian League, and he also competed in the EuroLeague, for the first time.

On December 30, 2011, McGrath joined the Italian club Teramo Basket, on a one-month contract, with an option for an extension until the end of the season.

[2] For the 2011–12 season, McGrath signed with the French club Cholet Basket, of the LNB Pro A league and the EuroCup.

[5] However, on August 31, 2016, McGrath terminated his contract with the team and returned to the United States, after he found out that his father had been diagnosed with an undisclosed form of cancer.