Stefanos Tsitsipas says it would mean a lot to achieve his boyhood dream of becoming world number one but he is not going to let that pressure stop him from enjoying the ATP Finals.Tsitsipas has been a top ten player consistently since March 2019, but he has never reached higher than world number three, where he currently sits now.With the ATP Finals due to start today, there is a chance he can take the top spot from Carlos Alcaraz, who has had to withdraw due to injury. However, to do so, would require a clean-sweep of results, winning all five matches in the tournament and taking all possible 1500 points. “I’m actual …