 Complete the following phrase:  Selby lost the top ranking position to OSullivan on 24 March 2019, having been world number one since February 2015. OSullivan reclaimed the top spot by winning his 36th ranking title at the Tour Championship; Selby had himself been eliminated in the first round by Neil Robertson in a final-frame decider, after squandering a four-frame lead. He had an opportunity to regain the top spot at the China Open less than two weeks later, but lost 36 to Craig Steadman in the qualifying round which had been held over from the original qualification stage in February. At the 