That looked a questionable decision when she trailed by a set and a break to 107th-ranked Diyas but
Boulter has proved herself quite the competitor in her fledgling career and she battled back to win 6-7 (1) 6-4 6-1.
Boulter then led 6-4 in the tie-break only for Putintseva to save two more match points before squeezing home.
Boulter then led 6-4 in the tie-break but again just could not break the Kazakh down, and when Putintseva's first chance came, she grabbed it.
If
Boulter is not fit, Keothavong would have to call on either out-of-form Heather Watson or the inexperienced Harriet Dart or Katie Swan.
Norrie, 90th in the rankings, earlier beat Tiafoe 7-6 (4) 6-0, but Williams levelled the contest by seeing off
Boulter 6-1 7-6 (2).
Boulter said the flights would be operated by the airline's Airbus A320 models, with a single class configuration and a passenger capacity of 180 to 186 passengers.
Apart from Leicester City fan Katie
Boulter, they are all making their debut.
Boulter, currently the airline's Chief Strategy Officer, would be taking over from him.
Kenneth Milne and Paddy McNally's new edition of the
Boulter Letters is a significant contribution to the corpus of printed source material available for scholars and students of Irish history.
Husband, father and grandfather, John Duncan
Boulter, who was known as Duncan, died at the age of 65 in early 2016, from mesothelioma, a terminal lung cancer caused in the majority of cases by asbestos.
Great Britain's Katie
Boulter came close to a shock debut victory at Wimbledon but ultimately came up short against American Christina McHale.
announced that Brian
Boulter has joined the Company as Director, Self-Storage.