Lee Wai Sze

In February 2013, Lee carried on her good form and won gold in the women's 500m time-trial at the World Track Championships in Belarus. She became the first female and third overall athlete from Hong Kong to wear rainbow jersey. After the gold, Lee beat Guo Shuang of China in Women's Sprint and won a bronze medal, securing her second medal in Minsk. This is the first time any HK athlete won multiple medals at a World Championship event.

Her greatest success to date is winning the bronze medal in the women's keirin at the 2012 London Olympics, Hong Kong's third-ever Olympic medal and first in cycling.

In February 2012 at the 2012 London Track Cycling World Cup, Lee upset Olympic champion Victoria Pendleton to win a bronze medal in the sprint event at the London Velodrome. She beat Pendleton 2–1 after losing to eventual champion Guo Shuang of China in the semi-finals. Lee also won a silver in the keirin final. The Union Cycliste Internationale described 24-year-old Lee as "a late revelation in the sprint events" after she claimed her second medal.

Lee was chosen as the flag bearer of the Hong Kong Olympic Representatives for the 2012 Summer Olympics in London. She won the bronze medal in women's keirin. Lee's bronze medal feat handed Hong Kong their first ever Olympic medal in cycling, and only their third overall. Lee also participated in the women's sprint event although she did not progress through the 1/8 Finals after losing to Cuba's Lisandra Guerra. Lee eventually finished at the 10th place. Lee received HK$ 750k from the Hang Seng Athlete Incentive Awards Scheme for her achievement in the Games. In an interview with Ming Pao, Lee said she hoped her achievement in the London Olympics can inspire a new generation of Hong Kong athletes for the 2016 Olympic Games. She loved cycling but she is going to retire soon

After the Olympics, Lee had a perfect start in the 2012–13 World Cup opening series with a gold medal in the women's sprint in Cali, Colombia, which is her first victory in a World Cup event. This is followed by a bronze in women's keirin in the second leg, which was held in Glasgow, Scotland. Lee won her first medal in 2013 by coming third in the women's sprint event in the third leg of the 2012–13 World Cup series.

Lee captured the attention of Hong Kong when she won gold at the 500-meter time trial track cycling event at the 2010 Asian Games, in which she broke the Asian Record in winning the championship with a time of 33.945 s. Lee also won a bronze in the sprint event. In December 2010, Lee improved her Asian Record in 500-meter time trial with a time of 33.939 s in the 2010 Melbourne Track Cycling World Cup. Lee's performance has impressed the cycling hierarchy, and she received the Hong Kong Potential Sports Stars Awards for 2010. She has also received the Medal of Honour from the Hong Kong Government in 2011 for her outstanding achievements in international cycling competitions.

Lee is a Baptist Christian. In 2009, she enrolled on a distance-learning course to study theology with the New York Theological Education Center Chinese Online School of Theology.

Lee became a full-time athlete in 2004. Initially trained as a road cyclist, Lee was in danger of bowing out of cycling after a serious accident in 2006 as she swerved to avoid a stray dog during training, where she suffered a broken left scaphoid bone. Lee is coached by Jinkang Shen, who has also coached other successful Hong Kong cyclist including Kam-Po Wong.

Lee Wai Sze, BBS, MH (Chinese: 李慧詩 ; Jyutping: lei wai si ; born 12 May 1987) also known as Sarah Lee, is a Hong Kong professional track cyclist.

Lee was born on 12 May 1987 in Kowloon, Hong Kong. She grew up in a poor family in Ngau Tau Kok, sharing a 200-square-foot public flat with her parents and two older siblings. Lee attended two schools in the locality, Bishop Paschang Catholic School and Leung Shek Chee College.