Sergio Garcia carded a sublime, seven-under-par 64 to move within touching distance of a third Andalucia Valderrama Masters title.
"Every time you win is special, and every time you have a chance of winning is special", Garcia, the tournament victor past year and in 2011, said.
The Ryder Cup record-breaker restored his four-stroke cushion when he drained a tricky downhill putt for his third birdie of the day at the long 17th, and he closed with a cast-iron par to win his 34th professional title.
Leader - and host - Garcia only managed to play seven holes before organisers halted the action, the Spaniard having picked up a shot at the fourth before immediately handing it back at the next hole.
But a bogey at the 13th saw him drop back to 10 under, and with a charging Lowry notching three birdies in a row from the 10th hole, his lead was down to one shot.
Saudi Arabia ADMITS Jamal Khashoggi is dead
He said Saudi officials, including the crown prince and his father King Salman, had promised a transparent probe. PRESIDENT DONALD TRUMP: It will have to be very severe. "It's bad, bad stuff". "But we'll see what happens".
Winning Numbers in 1.6 Billion Dollar Mega Millions Jackpot Announced
Others are already self-read experts on how to deal with such an enormous and public prize. "Oh man, I don't know". The odds to win the grand prize were 1 in 258,890,850. "There are approximately 303 million to one combinations".
Prince Harry opens extended Anzac Memorial in Hyde Park
The source reportedly said that the word normal "looms large for Harry and Meghan when it comes to their child's future". No decisions have yet been taken about the Duke and Duchess' plans in Fiji and Tonga, where they are due next.
"Every time you win is special, and every time you have a chance of winning is special", Garcia said.
While Lowry ran up a double bogey at the 15th, Garcia added birdies at the 14th and 17th to give himself a cushion playing the last.
After four hours were lost to stormy conditions on Thursday, two further delays yesterday meant half the field, including Chesters - who is five-under after a first round 66, one shot ahead of Scot Marc Warren and France's Gregory Bourdy - and defending champion Sergio Garcia, had yet to begin their second rounds.
Shane Lowry and Gonzalo Fernandez-Castano share third place at 6 under.