Rohan Bopanna came from behind to topple second seed Louk Sorensen and book a berth in the singles event of the ATP Challenger tournament in Aachen, Germany. The sixth seed Indian beat his Irish opponent 4-6 7-6, 6-3 in the third and final qualifying round to enter the main draw of the hard court event. Bopanna will take on local lad Simon Stadler in his first round match.