British teenager Andy Murray has won his first tennis match under new coach Brad Gilbert, firing 13 aces to defeat Ramon Delgado of Paraguay, 6-4, 6-3, at the Legg Mason Tennis Classic in Washington.

The 19-year-old player from Scotland won 26 of 37 first-serve points Wednesday to reach the third round of the hardcourt event. His match lasted just 88 minutes in sweltering 37-degree Celsius heat.

Murray will play again Thursday against either Spaniard Feliciano Lopez or Russian Teimuraz Gabashvili for a place in the quarterfinal round.

Russian seventh seed Dmitry Tursunov advanced when Edgardo Massa of Argentina retired with a right shoulder injury with the match even at 6-3, 1-6, 3-3. Denis Gremelmayr ousted fellow German Bjorn Phau, 6-4, 6-3.