AS IT HAPPENED: Sarah Lee Wai-sze breaks down in tears as German rival ends her medal hopes at Rio Olympics
Hong Kong's London 2012 bronze medallist goes home from Brazil empty handed
Hong Kong's best medal hope, Sarah Lee Wai-sze, broke down in tears in Rio after Kristina Vogel beat her in the sprint.
Lee said she thought she would have got at least silver in the keirin had she not been knocked off her bike by Australia's Anna Meares.
Sporting a large scrape on her leg and bruises on her shoulders after the keirin crash, Lee said she hadn't been able to sleep properly and that affected her tactically against German Vogel, who was a comfortable victor in both their qualifying races.
Lee said she wanted to take a break before deciding what's next, although coach Shen Jinkang was confident the London 2012 bronze medallist would be back to challenge at Tokyo 2020.
And she aims to win at the UCI World Championships that will be held in Hong Kong in April to 'atone' to her fans.
Catch up with all the action below as it happened live
Sarah finishes 6th overall, second to Zhong Tianshi in the 5th-8th place race. Let's see if we can get any comments
Bah humbug. Don't know if Lee was out of sorts or just Vogel was too wily for her, but she never really challenged in either of those two races.
For completeness' sake, Elis Ligtlee won her quarter-final again.
She faces James, Vogel faces Marchant, so it could be an all-GB final
Lee probably just wants to head home but has to race in the slap-in-the-face 5th-8th place ranking race in about 40 minutes.
Hopefully get some reaction from her here after that
Sarah Lee is OUT.
After Lee leads out, Vogel attacks on the high side midway through lap 2 and through Lee tried several moves to get back in front, but again the German's reactions are just too fast.
No medals for Lee – and almost certainly none for Hong Kong here in Rio. Aaaargh.
As expected, the second quarter is another easy win for Britain's Katy Marchant, Lithuania's Krupeckaite not getting anywhere near her. Lee up next
Here we go with round two. If Lee loses – she's out.
First up it's James v Zhong. Again it's super close, neck and neck on the last lap, and again it's James who wins. The Brit first through to semis
The Chinese reigning world champion, and gold medallist in Rio in the team sprint is going home.
Interesting. Coach Shen Jinkang and an assistant I don't know seem to be waiting at the judges' table with a laptop.
Might be absolutely nothing, might be they've spotted something they want judges to look at.
After an animated discussion with an official, with much hands-apart-distance-measuring gestures, it seems like their complaint, whatever it may have been, has been dismissed
Aiya. Not a good start from Lee, who now has to beat Vogel twice in a row to get to the semis. Tried everything to get her nose in front but the German seemed wise to every move.
Massive effort required now if Hong Kong's last realistic medal hope is not to evaporate.
Next round is in about 25 minutes
Lee's odds have gone out to as high as 50-1 with British bookmakers. They have Becky James as odds-on favourite, but the massive weight of money will be on her and her British teammate. Time for a specualtive punt on Lee?
10:15 – QF 4 Elis Ligtlee v Anastasiia Voinova
A fairly comfortable looking win from Ligtlee, who kept the Russian at her back for the whole race and won by a wheel
10:10 – QF 3 SARAH LEE WAI-SZE v Kristina Vogel
The pair start directly in front of our commentary position. Mutliple world champion Vogel sets a deliberate pace, ducking and weaving to fend off Lee's attacks.
She keeps Lee firmly on her back wheel throughout, not giving a millimetre, and edges the Hongkonger for first blood.
Lee must win the next two races to go through
10:05 - QF 2, Katy Marchant v Simona Krupeckaite.
Marchant goes on the attack early in lap 2, ducking down on the inside from the banking and taking a massive lead. All too easy as her coaches tell her to chill out on the way to the finish line
10am – Here we go with the first quarter-final of the day, Becky James v Zhong Tianhshi. Sarah Lee rolling around the warm-up area in front of us.
Zhong takes the lead-out and sets an extremely slow pace, eye over her right shoulder on James.
The pace picks up midway through lap 2 as James goes on the attack
It's NECK AND NECK all the way from the halfway point in lap 3, it looks like Zhong has held her off, but James nicks it by a nose. 1-0 to the Brit
9.45am Sarah Lee preparing for action at the other side of the Velodrome from us. Hong Kong cycling great Wong Kam-po is there to keep her fired up.
It being early, the Velodrome is pretty far from full just now, but will no doubt be packed as the day goes on for the last day of track cycling action here in Rio.
Here's the times of the women's sprint matches in HK time (race 1, race 2, race 3). Hopefully there will be a lot of bleary-eyed happy Hongkongers in work tomorrow.
Quarter-finals – 9pm, 9:41, 10:19
Semi-finals – 3am, 3:36, 3:58
Final - 4:44, 5:04, 5:26
9.30 am Good morning (Rio time), good evening (Hong Kong time)
We're in place at the Olympic Velodrome to watch Sarah Lee Wai-sze's medal quest in cycling's women's sprint.
She takes on German star Kristina Vogel in the quarter-finals at 9pm HK time.
Lee is third up in the four quarter-finals, which are best-of-three matches.
Here's the draw:
Rebecca James (GBR) v Zhong Tianshi (CHN); Katy Marchant (GBR) v Simona Krupeckaite (LTU); Lee Wai-sze (HKG) v Kristina Vogel (GER); Elis Ligtlee (NED) v Anastasiia Voinova (RUS).
Stay tuned here for regular updates from trackside