Federer leads his head to head with last-eight opponent Mayer 7-0, including three straight-sets wins in Halle (2005, 2012, 2015).Federer, who won his first title in Halle 14 years ago, did not even drop a set during this year’s tournament and he will now be confident of mounting a serious challenge for an eighth Wimbledon title, with the third major of the year set to get underway on July 3. In the victory, Khachanov won 71 percent of his first serve points and 40 percent of his second serve points.Querrey, the 2010 Queen’s champion, is no slouch on grass either, but Muller held his nerve in two tight sets to clinch his first win over the world No 28. Nonetheless, Zverev did enjoy a strong week in Halle, one that saw him defeat Paolo Lorenzi, Philipp Kohlschreiber, Roberto Bautista Agut, and Richard Gasquet en route to the final.Federer has reached his 11th final in Halle without dropping a single set.The 35-year-old broke in the opening game of the match to establish his control and did not offer a reprieve as he dominated from start to finish.Fourth seed Zverev, who beat Federer in the semi-finals previous year before losing to Florian Mayer in the final, won 4-6 6-4 6-3 against France’s Gasquet.How do they match up? He also beat Federer in the semi-final of this very tournament just past year.”I hope to get some matches next week (in Antalya) and then get ready for Wimbledon”.Zverev has a very bright future in the game, and has a victory over Federer at this very venue. He earned a second break point with some deft volleying, which he pounced on to race through the first set in 24 minutes.His huge serve was on full display when he won the ‘s-Hertogenbosch title on grass last week and once again he used it to devastating effect against Querrey.Thoughts on the final matchup?