World number two Elshorbagy, a runner-up to compatriot Ramy Ashour in 2012 and 2014, prevailed 11-5, 9-11, 11-7, 9-11, 11-6 over younger sibling Marwan in what was the first time two brothers had contested the final of the tournament in its 41-year history.

A nail-biting encounter went all the way down to the wire, until 26-year-old Mohamed fired off seven successive points from 6-4 down in the decider to capture the biggest title of his career and the 30th overall.

Victory continues his stunning form, which has seen him win six of his last seven tournaments.

"It feels great, it’s a dream come true," Elshorbagy said.

"At 11-9 on the fourth it was a huge blow, then I was down in the fifth and I had to fight and fight.

"He gave it everything.

"I remember the 2012 match with Ramy - I know how he felt now.

"There was so much pressure on me, like Ramy in 2012, and in these matches you just want to win the last point.

"At the end we congratulated each other.

"It was my time today.

"With this title you have to be patient and it will come for him.

"I've won everything in the sport now, but I still have much more to achieve and more titles to win."

El Welily had also suffered two World Championship final defeats in the past, but it was third time lucky for the world number two after she came back from a game down to beat defending champion and compatriot Nour El Sherbini 3-11, 12-10, 11-7, 11-5.

The 28-year-old had lost out out in straight games to El Sherbini in the previous Women’s World Championship final, which took place in El Gouna in Egypt in April, and the scoreline looked to be heading down the same route as the world number one took the opening game for the loss of just three points.

But a resilient El Welily battled back over the course of the next three games, taking a crucial second game on the tie-break before claiming wins in games three and four to wrap up a memorable victory.

"She was under more pressure than me today," El Welily, who now has 16 career titles on the PSA World Tour, said.

"I felt so different today compared to the last World Championship final.

"That one was a nightmare.

"Today I was so much more relaxed."

She added: "So much has changed since 2014 [when El Welily lost in the final to Malaysia's Nicol David].

"The game has changed, I have changed, the sport is different from then.

"We're all adapting and improving.

"I hope I can keep the same attitude for the remainder of the season.

"From this moment to the next event I don't know what will happen, but I know I don't want to stop with just this one success."

For the first time in history, the women's prize money was equal to the men's with $45,000 (£34,000/€38,000) being awarded to each of the winners.