 Complete the following phrase:  Grega Žemlja born 29 September 1986 is a retired Slovenian tennis player. He has won five singles titles and one doubles title on the ATP Challenger Tour. In 2012, he reached the third round of the US Open, the first Slovenian male player ever to reach that stage in a Grand Slam tournament. He is also the first Slovenian ATP player who in 2013 reached third round at 