Serena Williams returns against Camila Giorgi during their quarter-final at the All England Club.

London (AFP) - Headlines and sidelines at Wimbledon on Tuesday:

- Headlines -

+ Serena survives Giorgi scare, into semis

+ Del Potro sets up Nadal QF clash

+ Kerber sinks Kasatkina for semi spot

+ Ostapenko beats Cibulkova in QFs

+ Goerges recovers from set down to beat Bertens

- Sidelines -

A World War II Lancaster bomber and Spitfire planes fly in formation to mark the centenary of the Royal Air Force, seen from the Wimbledon tennis championships.

Plane-spotters’ delight

– Aviation fans gathered on Henman Hill for a view of the Royal Air Force centenary flypast over central London. Several planes – including a Lancaster bomber and several Spitfires – flew on over southwest London giving tennis-watchers an extra thrill.

Ranking record

– Serena Williams was the lowest-ranked player ever to reach a Wimbledon quarter-final. Her ranking is 181.

Spot the top seeds

– For the first time in Wimbledon history, no woman from the top 10 seeds reached the quarter-finals.

Ostapenko solo

– Jelena Ostapenko is the last remaining of the 10 junior Wimbledon champions who began the tournament. Only four girls’ title-winners have ever gone on to win the women’s singles: Ann Haydon-Jones, Karen Susman, Martina Hingis and Amelie Mauresmo.

- Who’s saying what -

France's Manon Leonard throws the ball to serve during a girls' singles match.

“He’s two metres tall. He’s serving from the sky. He’s serving a lot of aces. I’m able to return when I can reach the ball, but it’s very often that I’m not reaching the ball.”

– Gilles Simon on facing Juan Martin del Potro.

“Yeah, of course. I lose.”

– Daria Kasatkina, when asked if there was anything about her match against Angelique Kerber that she didn’t like.

“I did ballroom dancing from five to 12. I quit for some years, but now I’m doing it as a hobby. I think it helps a lot because you have to be very coordinated to do it, and also those small steps, which are very useful in tennis.”

– Jelena Ostapenko, who said samba was her best dance.

A man dresses as the men's Wimbledon tennis trophy.

“I don’t know.”

– Juan Martin del Potro on how he can beat Rafael Nadal in the quarter-finals.

“I think she said, I’m sorry. I’m like, ‘You don’t have to be sorry. I’m really happy for you. You really deserved this’.”

– Kiki Bertens on what Julia Goerges said after claiming victory in their quarter-final.

“I hate losing. I mean, that’s no secret. But you got to lose. I feel like every time I lose, I get better.”

– Serena Williams.

- Numbers up -

Germany's Angelique Kerber celebrates winning a point against Russia's Daria Kasatkina.

41,144 – Wimbledon attendance on Monday.

42 – Grand Slam appearances by Julia Goerges before making a quarter-final. Only Tamarine Tanasugarn (45), Farina Elia (44) and Elena Vesnina (42) have ever taken as long in Open tennis.

41 – Years since a Dutchwoman reached a Wimbledon quarter-final. Kiki Bertens is the first since Betty Stove, who lost to Virginia Wade in the 1977 final.

7 – Different countries represented in women’s last eight.

4 – Women appearing in the quarter-finals for the first time.

1 – Number of last year’s ladies’ quarter-finalists to make it this time: Jelena Ostapenko.

0 – Italian women who have reached a Wimbledon semi-final.

- Royal Box watch -

Rapper Drake sits on Centre Court.

Outside the posh seats, rapper Drake and pop star Justin Timberlake were also seen watching Serena Williams face Camila Giorgi.

Inside the Royal Box, Queen Elizabeth II’s only niece Lady Sarah Chatto was joined by chef Mary Berry.

Tennis stars Kimiko Date, Daniela Hantuchova, Billie Jean King and Iva Majoli got an invite.

From other sports: British Olympic athletics gold medallists Kelly Holmes and Denise Lewis and former England footballer Graeme Le Saux.

And from the world of entertainment: Oscar-winning actress Vanessa Redgrave, musicals star Elaine Paige, and Golden Globe-nominated actress Michelle Dockery.