Tai Chengzhe / TOP147.com
Mehta, who celebrates his 27th birthday today, gave himself the perfect present with a fine display against Wuxi Classic finalist Bingham to set up an intriguing match with Judd Trump on Wednesday evening.
Mehta, who is based in Sheffield during the snooker season, has scored some promising results over the past two seasons but has taken a giant leap forward in this event as he had never previously qualified for the final stages of a ranking event.
He won the first four frames against an out-of-sorts Bingham despite a top break of just 47. Bingham fought back to 4-4, but Mehta proved stronger at the buisness end, winning frame nine by clearing from brown to pink then securing victory in the next.
"I didn't deserve to be 4-0 up, the balls just favoured me," said the player from Maharashtra. "I knew I would have to work hard for those last two frames. I tend to play better when matches go close so when it was 4-4 I still felt confident. I potted some good balls in the last two frames.
"It's definitely my best win so far because Stuart has been one of the best players in the world this season. It's great for my country. I will need to play better tomorrow and I am ready for it."
Trump eased into the last 16 with a 6-3 win over Fergal O'Brien and believes he has added consistency to his game.
Trump agonisingly missed out on the Shanghai Masters title last month, losing 10-9 to John Higgins in the final after leading 7-2, but hopes the wait for his first ranking title since last season's UK Championship will soon be over. He has climbed to No 2 in the world and aims to go one place higher.
The 23-year-old from Bristol went 4-1 up with top breaks of 80, 118 and 96. O'Brien won the next two frames with 60 and 59 before Trump made it 5-3 with a 64. Frame nine could have gone either way but a mistake from O'Brien on the final pink allowed Trump to clinch the tie.
"I played well in patches although I got tired towards the end," said Trump. "Everyone has got their own way of playing, so I tried to stay patient and not get annoyed when things weren't going my way. I am trying to get to the top and I feel I am getting more consistent. But there is a long way to go and I have a lot of improving to do."
Trump fended off a question from a Chinese journalist about some pictures of him in a Chengdu nightclub which appeared on his Weibo page, by joking: "That wasn't me, it was a lookalike. I haven't been out since I got here!"
Home favourite Ding Junhui has a poor record in Chinese ranking events in recent years, but looked sharp in a 6-1 win over Zhou Yuelong which featured breaks of 53, 63, 103, 128 and 91.
"I played better this time and I felt good," said two-time UK Champion Ding. "I am confident of winning."
At the end of the press conference he was presented with a toy panda by journalists and asked to give it a name, and the World No 12 christened the cuddly bear 'Ding Ding.'
Ricky Walden survived the challenge of Chinese wild card Lu Ning in a high quality match, winning 6-4. Walden led 3-0 after runs of 60 and 113, then Lu recovered to 3-3 with high scores of 60 and 134.
Walden regained the lead with an 82 then Lu made a cool 67 clearance for 4-4. But it was Wuxi Classic winner Walden who had the final word with 78 and 67 to win the last two frames and earn a match with Mark Selby.
Ball by ball scoring and results from tournaments