article_snippet: Sean Safo-Antwi was the third Briton to reach the semi-final stage of the event .
article_snippet: The third Briton in the field, Sean Safo-Antwi, also booked Sean Safo-Antwi place in the semi-finals, clocking 6.67.
article_snippet: The 19-year-old history student clocked 7.10, a personal best, to win Dina Asher-Smith heat with ease.
article_snippet: Dina Asher-Smith was the joint second fastest qualifier, with Dutch gold medal favourite Dafne Schippers leading the way with 7.07.
article_snippet: Germany's Verena Sailor also clocked 7.10 and the medals look set to be shared among the trio.
article_snippet: Rachel Johncock also went through in 7.26.