Live - Del Potro v Soderling

LATEST UPDATES (all times GMT)

606: DEBATE Your thoughts on the action

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By Mark Ashenden

BBC Sport's Piers Newbery Tweeting from the O2 Arena: "I can hear the sounds of a robin soderling intro and I never like to miss that so heading into the arena. Too close to call... Delpo in 3?"

2042: Hands up. Can you see me? Yep, I'm holding both arms up and waving them in the air like I don't care. A big boo-boo to start the evening with. See three comments below. I've shockingly Iriana Davydenko suggested Nikolay's wife is a he. She clearly is a she. Official. Sorry Mrs D. That three bean salad has clearly played havoc with my brain. I hope she forgives me.

clareisle on 606: "Hope Sod wins to night as I don t want Potty to overtake Andy in the rankings then Davy to win the event as I dont really like the Sod and I think Davy should win a big one."

Boxing world champion David Haye at the O2 to see Roger Federer!: "I don't follow tennis that much but I'm looking forward to it." He also reveals he's not very good at tennis!

Iriana Davydenko (who is also a psychologist) on her husband's win over Federer: "I am very happy. He works very hard. He played better today. I believe in him all the time. I believe he can win."

2028: Silverware is not the only thing on the line this weekend. Andy Murray will be watching intently with his number four ranking under increasing threat. If Del Potro (ranked five) wins the tournament tomorrow he will switch places with Muzza. So what are your predictions? Del Pots in three I said earlier. Two cups of tea and a sensational three bean salad, complemented with a full bowl of potato salad, has not encouraged me to change my mind.

2024: BBC Radio Five live sports extra has all the commentary for you, and why not at the same time follow all the action in a live text format right here, right now. Look out for Tweet updates from BBC Sport's Piers Newbery who's battling some wobbly technology at the O2. With just over 20 minutes to go, let's get interactive. That means YOU get creative and you do some work. Text 81111, 606 or Twitter

2018: Five down, three to go. Hopefully the O2 Arena will have mopped up the tears of the world number one this afternoon after Federer lost out to Nikolay Davydenko in three topsy-turvy sets. So who will meet tennis's equivalent of Cliff Thorburn? (Grinder) We've got a lanky explosive Argentine who's rather partial to a vest (and who the heck isn't?) and on bloomin' fire right now, up against the mighty tireless Sodders aiming to be the first Swede since 1990 (Stefan Edberg) to reach the last two of the ATP Tour World Finals. Thoughts? Predictions? Kick off at around 2045 GMT. Fancy being part of the build-up?

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