The proceedings are certainly starting to take shape at Wimbledon this month, with upsets, comebacks and heavy defeats aplenty.
However the tie of the tournament so far is undoubtedly upon us on Monday, as the Williams sisters Serena and Venus prepare to go toe-to-toe.
With 26 Slams between them, there has rarely been a more dominant force between them in world sport.
But how does their rivalry on court rank against siblings in other disciplines?
Today we are asking you to vote on the greatest sibling rivalry in sport, and these are our candidates.
Serena and Venus Williams
While Serena may now be the dominant sister, she hasn’t always been quite a cut above her 35-year old sibling.
Venus claimed back-to-back Wimbledon and US Open titles in 01-02, assuming the world number one spot in the process, before her younger sister stormed onto the scene in real style.
With a 3-2 advantage in their SW19 match-ups Monday’s contest could be a tight one.
Jack and Bobby Charlton
Both may have played a part in shaping England’s history throughout the 1960s, but the Charltons’ club career saw them opt for contrasting sides.
While one became a Red Devil legend, with his wizardry in attack, the other manned the back-line at a tough-tackling Elland Road outfit. Bobby may be the more recognised and celebrated of the pair, but they certainly delivered some hard fought battles on the pitch.
Alistair and Jonathan Brownlee
The Brownlee brothers have dominated the world of triathlon for the best part of five years now, with six individual World Championship gold medals between them, as well as two team gongs in the most recent pair of renewals.
A gold and bronze medal haul from the Yorkshire siblings at the London Olympics was surely up there with the families greatest achievements.
Eli and Peyton Manning
Peyton Manning seemingly sits in the interesting position that while he is arguably the greater quarterback from this generation of the Manning clan, his brother Eli’s SuperBowl ring haul outnumbers his two to one.
While the younger Manning may have talked about how he feels there is no rivalry whatsoever between the pair, one can’t help but think the fire stoked even more when they cross paths in the NFL.
Wladimir and Vitali Klitschko
The pair may have promised their mum that they wouldn’t square up in the ring, but the Kitschko’s rise through the heavyweight ranks has a distinct whiff of a rivalry about it.
Between them they won 109 of 114 professional bouts, Vitali successfully defending the WBC belt on nine occasions to date, while his younger brother has seen off the same number of challengers to his WBA title in fine fashion.
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