Continuing our look back on the 2017 ATP World Tour season, we focus on the start of the hard-court swing, from Sascha Zverev's victories in Washington and Montreal through to Grigor Dimitrov's maiden Masters 1000 title in Cincinnati.Along the way, we hear from Andy Roddick, Wayne Gretzky, Sascha Zverev, Brad Gilbert, Nick Kyrgios, Mark Woodforde and Grigor Dimitrov's coach, Dani Vallverdu.