Complete the following sentence: From the summer of 2015 to early 2017, Pepperell's best performances on the European Tour were 8th places and he dropped out of the world top-500. <unk> <unk> <unk> <unk>
2017 U.S. Open through the European sectional qualifying at Walton Heath and had his best performance in a major championship, finishing tied for 16th.