Murray and Lopez clinched the final as Mourinho was extremely happy to see the former world No. 1 back in action following a hip resurfacing surgery.
"It's been brilliant, I've really enjoyed it", Murray said of his first competition since undergoing "life-changing" hip surgery earlier this year.
While Lopez has had an exhausting week - he still has to play the doubles final with Andy Murray - 34-year-old Simon also played inspired tennis despite all his matches going to three sets.
(Photo by Daniel LEAL-OLIVAS / AFP) DANIEL LEAL-OLIVAS/AFP/Getty Images LONDON, ENGLAND - JUNE 23: Andy Murray of Great Britain and partner Feliciano Lopez of Spain celebrate victory with the trophy in the mens doubles final against Rajeev Ram of The United States and Joe Salisbury of Great Britain during day seven of the Fever-Tree Championships at Queens Club on June 23, 2019 in London, United Kingdom.
Murray, who had chatted with former Manchester United manager Jose Mourinho while he was warming up, produced the shot of the ensuing tie-breaker, racing back to get to a lob and unleashing a stunning backhand victor.
HALLE, Germany (AP) - Roger Federer will play David Goffin in the final as he bids for a record-extending 10th Halle Open title on Sunday.
He dropped serve sloppily at 2-2 and faced four match points when he served at 3-5 but hung on grimly to test Lopez's nerve.
However, his brilliance was epitomized when he fired an unstoppable forehand victor off a Kontinen serve to secure a break point and they moved 6-5 ahead when Peer fired long.
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It was Murray's first doubles success for eight years and, with no signs of physical distress from his metal hip implant, he will surely be among the favourites to win the men's doubles title at Wimbledon next month.
The 37-year-old had spent just shy of five hours on court playing three different matches on Saturday, getting through to the singles final before returning to what this week has seemed far more important, the doubles.
The victor of the final will claim 500 ranking points, whilst the loser will claim 300 ranking points, with both set to play again in Eastbourne next week.
'What was I doing' Lopez - who Murray may regret overlooking as his doubles partner for Wimbledon - earned a pat on the back from Murray.
The semi-final looked to be heading towards similar territory after a first set lasting more than an hour, won by Medvedev on a tie-break.
"It was a good match". We're so happy that you're back on a tennis court. Murray will continue his preparations on the grass in the next week before the start of Wimbledon on July 1st.
The second set was equally close, with both pairs fending off break points until Salisbury and Ram finally secured the first break of serve in the match. He's not young anymore.
Feliciano Lopez became the oldest Queen's singles champion on Sunday when the 37-year-old Spaniard defeated Frenchman Gilles Simon in a thrilling three-set clash, 6-2, 6-7 (4/7), 7-6 (7/2).