The 37-year-old Wawrinka hit his ninth ace to seal a 6-4, 6-4 win over Ruud, who was the U.S. Open runner-up last month, and delight his home crowd.

Wawrinka is now ranked No. 194 after persistent injury problems but the win was his second over a top-five opponent in five weeks. He beat fourth-ranked Daniil Medvedev last month in Metz, France.

``I fought despite the injuries. I wanted to come and play in front of you,`` Wawrinka said in a tearful on-court interview, thanking fans for their support.

Murray, a former U.S. Open champion like Wawrinka, earlier won 6-7 (5), 6-3, 6-4 against Roman Safiullin after the Russian led 4-1 in the final set.

The 35-year-old Murray, who also won two Wimbledon titles, reeled off five straight games to complete the victory after more than 2 { hours on court. It was the No. 49-ranked Scot's first match in Basel since 2005.

``I changed the way I was returning a little bit and when I did that I was able to create a few more opportunities and frustrate him a little bit,'' Murray said.

Wawrinka first played in Basel 19 years ago but never went beyond the semifinals at the event won by hometown favorite Roger Federer a record 10 times.

Wawrinka next plays Brandon Nakashima of the United States. He could face Murray in the quarterfinals.

Another Swiss winner was 20-year-old Dominic Stricker who beat American Maxime Cressy 7-6 (4), 6-3. Stricker, a wild-card entry ranked No. 129, next faces Pablo Carreno Busta. The fifth-seeded Spaniard beat Sebastian Baez 6-2, 6-1.

(For more sports news and updates, follow Ahram Online Sports on Twitter at @AO_Sports and on Facebook at AhramOnlineSports.)