Maryland players won 23 medals, including nine gold and seven silver, at the U.S. Open Table Tennis Championships last week in Las Vegas. Charlene Liu, 63, of Clarksville won in over-50 women's singles and over-60 women's singles. She also teamed with her husband, Changping Duan, 66, to make the semifinals of over-60 mixed doubles. Another husband-and-wife duo, David and Donna Sakai, members of the USA Table Tennis Hall of Fame, both 68 and from Bowie, won several medals. David made the finals of over-65 men's singles, and teamed with Dell Sweeris of Grand Rapids, Mich., to win over-65 men's doubles and make the finals of over-60 men's doubles. Donna made the final of over-60 women's singles (in an all-Maryland final with Liu), and the semifinals of over-65 women's singles. She teamed with Connie Sweeris of Grand Rapids, Mich., the wife of Dell, to make the finals of over-60 and over-65 women's doubles. The Sakais also made the semifinals of over-60 mixed doubles. Crystal Wang, 13, of Boyds, who just finished sixth grade in the magnet program at Roberto Clemente Middle School, won three major titles, including finishing first in the junior (under 18) and cadet (under 15) girls team trials. As a member of both teams, she will represent the United States in competitions all over the world during the next year. She also won cadet girls singles (under 15) and made the under-21 women's singles quarterfinals.