Juan Martin del Potro advances in Cincinnati

Juan Martin del Potro overcame the challenge of veteran Tommy Haas to move into round three of the Cincinnati Open this evening.

The opening set was a fairly even contest as both players held their first five service games each.

However, Argentine Del Potro then claimed a decisive break of Haas's serve to go 6-5 in front, before serving out to take a one-set lead.

World number nine Del Potro appeared to gain confidence from his success and produced a string of forehand winners in the second set to which Haas had no answer.

The 23-year-old eventually ran out a 6-2 victor to book his place in quarter-finals, where he will face Viktor Troicki.