Tennis Roundup : De la Pena Upsets No. 7 Luiz Mattar

Horacio de la Pena of Argentina knocked off seventh-seeded Luiz Mattar of Brazil, 6-4, 6-3, in Wednesday’s only upset in the $425,000 U.S. Pro Tennis Championships at Brookline, Mass.

Eighth-seeded Thomas Muster of Austria narrowly escaped elimination, surviving a 2-hour 18-minute match with Jimmy Arias, 6-4, 3-6, 7-6.

Jimmy Connors breezed past Australian John Frawley, 6-2, 6-3, in the first round of the Gunze World Championships at Yokohama, Japan.

In another men’s match, Tim Mayotte rallied to beat Mark Woodforde of Australia, 3-6, 7-6, 6-2.

Etsuko Inoue, the No. 1 women’s player in Japan, defeated Melissa Gurney, 6-2, 6-3.