Duckworth downs Popyrin, Wolf edges Kozlov at San Diego Open
Seventh seed James Duckworth edged compatriot Alexei Popyrin in three sets, while eighth seed J.J. Wolf got past Stefan Kozlov in the San Diego Open first round on Monday.
Popyrin could only manage 35 winners with 18 unforced errors. Duckworth will face one of the American qualifiers, Mitchell Krueger and Christopher Eubanks in the next round.
Wolf needed one hour and 52 minutes to topple countryman Kozlov 6-2 7-6 (8-6), converting three of his six break points, getting the edge by winning 50 per cent on Kozlov's second serve.
In the battle of the Argentines, Tomas Martin Etcheverry defeated Facundo Mena 7-6 (8-6) 6-3. Mena hit 28 winners but was undone by 23 unforced errors.
Frenchman Constant Lestienne fought back from a set down to win over American wild card Brandon Holt 5-7 7-6 (7-5) 6-3.