Nigel Sears (born 4 April 1957) is a British tennis coach, best known for coaching former top five players Amanda Coetzer, Daniela Hantuchová and Ana Ivanovic during his long career.
Sears reached a career high singles ranking of World No. 382 on 4 January 1982, and a career high doubles ranking of World No. 581 on 2 January 1984. He lost his only professional singles match, but won two of the ten professional doubles matches he played.
Nigel Sears started coaching Slovakia's Daniela Hantuchová in 2001. Under his guidance, Hantuchová reached the world's top ten, won the prestigious Indian Wells tournament in California (though that would be her only career title until exactly five years later) and reached three consecutive Grand Slam quarter-finals between the 2002 Wimbledon Championships and the 2003 Australian Open (losing twice to Serena Williams and once to Venus Williams respectively).
It was during 2003 that the coaching relationship between Sears and Hantuchová started to come into question. At the French Open, Hantuchová lost a marathon second round match to Ashley Harkleroad in which she made over 100 unforced errors, which led to Sears publicly criticising her attitude. Having reached a career high ranking of World No. 5 earlier in the year, Hantuchová's results continued to deteriorate and by the end of the year she had dropped to No. 17, leading to a decision to temporarily split with Sears.
Sears and Hantuchová reunited in 2004, but on-court results did not improve, as Hantuchová further slipped down to World No. 54 before a late season resurgence saw her finish the season ranked World No. 31 and with an even win-loss record (24 wins and 24 losses).
The pair split permanently in 2006, after which Sears was appointed the captain of the Great Britain Fed Cup team.
In June 2011, Sears was appointed the head coach of former WTA World No. 1 Ana Ivanovic, with a view of reviving her ailing career. Since his appointment, Ivanovic's performances at Grand Slam tournaments have improved, and at the 2012 US Open she was finally able to her first quarter-final at that level since winning the 2008 French Open.