Serena Williams did much better than big sister Venus at Wimbledon, defeating Barbora Zahlavova-Strycova 6-2, 6-4 Tuesday in the first round. Playing on the same Court 2 where Venus lost a day earlier, Williams ground out a shriek-filled win over the 62nd-ranked Zahlavova-Strycova. Five-time champion Venus lost her first-round match in straight sets to Elena Vesnina…