sets 7–6, 6–3. Neither team converted their break opportunities in the first set, before Fyrstenberg and Matkowski took the advantage in the tie-break, winning it 7–2. The second set was more competitive, as Dlouhý and Paes managed to score one break, but their opponents scored three, to eventually claim victory after less than two-hours-and-a-half. The results of the day assured Nestor and Zimonjić of a semifinal spot, and Dlouhý and Paes of the fourth place of the group. The fourth day of the competition had started earlier with another withdrawal, as fifth seed and 2007 Masters Cup semifinalist Andy Roddick announced he was pulling out of the event, after injuring his ankle during a practice session on the previous day. "Yesterday in the warm-up during practice I just went over on it. [...] We tried the best we could to get it better but I can't really stop and start on it very quickly." commented Roddick. The American's withdrawal allowed 26th-ranked Radek Štěpánek, who accepted the invitation to Shanghai as first alternate, after sixteen players ranked above him, and below last qualifier Gilles Simon, refused to come to the Masters Cup. Roddick said he had called Štěpánek, before deciding not to play, to tell him he might enter the competition : "I called Štěpánek earlier today to let him know where my head was at, and then just told him when I came off the practice court. So he knew as early as anybody else." Štěpánek's unexpected appearance (Murray had commented "Štěpánek's turned up without his own racquets, he borrowed some socks off me earlier and he hasn't got his contact lenses either") marked the Czech's first career participation to the year-end championships. The third match of the Red Group, in the singles event, was a repeat of the Madrid Masters final which Andy Murray had won over Gilles Simon in straight sets less than a month earlier. The World No. 4 made the strongest start of the match, quickly racing to a 4–0 lead. The Frenchman then fought back to 4–3, but failed to break Murray a second time, letting the Scot use his advantage to win the set 6–4. The second set was a formality for Murray, who saved all three break points he had against him, and took Simon's serve twice to record his second round robin win, 6–4, 6–2, after one-hour and a half of play.