The 26-year-old world number four will join the world's top
three - Novak Djokovic, Andy Murray and Stanislas Wawrinka -
plus big-serving sixth-ranked Canadian Milos Raonic in London,
the ATP said in a statement.
Nishikori has had a strong year so far, having won his 11th Tour
title at the Memphis Open and reached the Australian Open
quarter-finals as well as the U.S. Open semi-finals.
Nishikori is currently nursing a muscle injury, which he
sustained during the Japan Open in Tokyo last week, and was
forced to sit out this week's Shanghai Masters.
(Reporting by Shravanth Vijayakumar in Bengaluru; Editing by Ken
[© 2016 Thomson Reuters. All rights
Copyright 2016 Reuters. All rights reserved. This material may not be published,
broadcast, rewritten or redistributed.