Two straight nights, two grueling, seesaw battles. Serena Williams took another step in her comeback from injury and illness Friday, fighting off another determined opponent at the Rogers Cup. The 29-year-old American booked her spot in the semifinals with a hard-fought 4-6, 6-3, 6-2 victory over Lucie Safarova of the Czech Republic. Read more: http://espn.go.com/tennis/story/_/id/6856627/serena-williams-rallies-reach-rogers-cup-semifinals