Stefanos Tsitsipas says he needs to improve his consistency at Grand Slams if he is going to be able to realistically take the next step in his career. Tsitsipas is the world number four but he is yet to win a major, although he has four semi-finals and a final to his name. His biggest problem has been becoming a regular threat at the majors, with 2022 illustrating what he needs to change. He started the year by reaching the Australian Open semi-finals and then got to the fourth round in Roland Garros. He was unable to get past the third round at Wimbledon though and suffered a first-round exit at the US Open. “I am a hard worker, I believe in what I do and I have the physical capacity to make it happen,” Tsitsipas said when asked about his chances of winning his maiden major in 2023.Tsitsipas has had to build his ranking on volume of events rather than maximum ranking points from majors. No man won more matches during 2022 and he went to Turin with an outside chance of ending the year as world number one. He, though, believes improvin …