British teenager Kyle Edmund claimed his first victory on the ATP World Tour with a straight-sets success over Kenny De Schepper at the AEGON International in Eastbourne.
Edmund, 18, produced a love service game to close out a 6-4 6-4 first-round success against a French opponent ranked 360 places higher.
The world number 442, from Beverley in East Yorkshire, will take on Gilles Simon in the second round.
World number 17 Simon hobbled off the practice court on Monday with ice around his left ankle.
Also on Monday, Italians Andreas Seppi and Fabio Fognini, the respective seventh and eight seeds, progressed to the second round.
Seppi saw off Frenchman Guillaume Rufin 3-6 6-3 6-4 and Fognini fought back from a set down to defeat Slovenia's Grega Zemlja 6-7 (6/8) 6-2 6-4.
American Ryan Harrison joined them in the second round thanks to a 6-4 2-6 7-6 (7/4) triumph against France's Paul-Henri Mathieu.
Harrison's compatriot James Blake was beaten, 6-2 6-4 by Spain's Albert Ramos.