It was far from pretty, but Iga Swiatek got the job done.The six-time grand slam champion booked her spot in the third round at the US Open thanks to a 6-1, 4-6, 6-4 victory over Suzan Lamens.Swiatek avoided a shock second round exit at the US OpenAFP via GettyThanks to her victory over the world No. 66, Swiatek has now become the only woman to reach the third round of every grand slam this decade.It was by no means a vintage display from the Pole, who has reached the fourth round at Flushing Meadows for the last four years.What was Swiatek’s verdict on the win?“I served better [in the third set] than in the previous sets,” Swiatek said on court after the win. “I wanted to be pretty confident with my serve and go for it. I’m happy that I closed it pretty fast, even though I lost one break.“It wasn’t an easy match and I made some mistakes. I’m happy that at the end I could be more proactive.”‘Things went off the boil’Although Swiatek may have been reluctant to be too overly critical of her own performance following a win, former Wimbledon winner Marion Bartoli and ex-British star Laura Robson didn’t exactly hold back.“I would not be surprised if they are already booking a practice this afternoon because that forehand got off-rail completely,” Bartoli said on Sky Sports.“I think Swiatek has done extremely well to not show too much frustration and just keep trying.”Robson added: “It felt like Iga lost control of her racquet head speed.“Things went off the boil, the attitude towards the end of the second set totally changed.The Pole got past Lamens in just over two hoursGetty“As the second set went on it was surprising to see the stress creep in, it’s been so many months since we’ve seen the attitude of Iga dip like that.”Bartoli wasn’t exactly wrong in terms of Swiatek’s forehand becoming ‘off-rail’.In the opening two sets, the Pole made 15 unforced errors on her forehand.By comparison, she committed just three in the final set.As for her backhand, Swiatek made just seven unforced errors across the entire contest.Swiatek will now face Anna Kalinskaya in the third round after the Russian beat Yulia Putintseva 6-1, 7-5. Their looming encounter at Flushing Meadows will mark the third time they have faced off, with Swiatek and Kalinskaya enjoying one win each.It is Swiatek who has the edge over Kalinskaya though, having beaten her rival in straight sets earlier this month at the Cincinnati Open.