Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: Could the golfing summer be set up any more perfectly? Is there anyone who now doubts we are in at the start of a rivalry that is going to have us pinned to our seats for the next decade? For the first time in the game’s long history the world No 1 and world No 2 hold all four majors between them and the next stop just happens to be — honestly, who is writing these scripts? — the Home of Golf itself. Who’s your money on? Rory McIlroy, the No 1 with all the talent, or Jordan Spieth, the No 2 infused with Texan grit? It is like Roger Federer against Rafael Nadal from a few years ago, only played out in wide open spaces and with smaller balls.Jordan Spieth won the US Open to claim his second major of 2015American and Rory McIlroy currently hold all four majors between themThe pair are set for a showdown at The Open in next major at St Andrews 
 Question:It is hard to imagine anything energising 26-year-old McIlroy more than a 21-year-old invading his territory but in _ he has clearly got the worthiest of adversaries.

Jordan Spieth