Neither coach could remember their head-to-head record over the years but they have greatly contrasting teams.
And while Sharapova leads the pair's head-to-head record 4-3, Williams is confident she can prevail despite her opponent's impressive start to the tournament.
Nadal is on a 66-match winning streak on clay and is one of the few men on the men's tour who has a favourable head-to-head record against Federer.
But in a match watched by Real Madrid star Cristiano Ronaldo, Tipsarevic was no match for Federer, who hit 25 winners to take his head-to-head record over the Serb to 5-0.
He had been expected to provide Federer with his first serious test of the tournament but a head-to-head record of 0-12 suggested Soderling might again find the Swiss a challenge he just could not overcome.
The two sides needed the play-off after Egypt's 2-0 win over Algeria on Saturday left the pair inseparable at the top of their group - with the same points, the same goal difference, the same number of goals scored and the same head-to-head record.
Djokovic had lost just one of his 19 matches since the US Open but that defeat came against Davydenko as the Russian stormed to the title in Shanghai last month, and with a 2-2 head-to-head record there was every reason to expect a tight match.
The NFL had a record seven African-American head coaches this last season, 2006 - a record 197 coaches, including seven assistant head coaches.
As for Lord O'Donnell, his record as head of the civil service and as a policymaker is widely respected.
That said, since he is the head of a major record label, he actually does have some power over how all this stuff plays out.
Ofcom said Mr Murdoch's record as head of the London-based News International newspaper group "repeatedly fell short" of what was expected and was at times "ill-judged".
His Purdue teams amassed 512 victories (and, he pointed out, a 21-20 record in head-to-head battles against Bobby Knight), but he never looked like he was enjoying himself.
SUVs for their poor safety record from the head of America's road-safety body.
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His own record as the head of the Jesuit order in Argentina at the time has been tarnished as well.
Admittedly, none of these men is perfect: Mr Fischer, for instance, is too old under existing rules and had a patchy record as deputy head of the fund.
He added that he had been "deeply shocked" by an example from last autumn after a new head with a proven track record started work at a struggling school.
My political record and my head was always there, always has been there, but I must say that it took life's experiences for me to absorb the real importance of it all.
CNN: Thompson's October 19, 2007, speech to Value Voters Summit
And if the main basis for him suggesting he can do a better job is his track record as the head of a private equity firm, then both the upsides and the downsides are worth examining.
Bronfman then hooked up Loquesea's head, Carlos Lizarralde, with record industry and media executives.
Yet the Trojans limped to a 7-6 record under 3rd year head coach Lane Kiffin, the worst season for the team in over a decade.
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All he cared about was breaking the all-time record set by Grambling State head coach Eddie Robinson.
Garvey will be setting up the label with Jim Chancellor, the head of Fiction Records, Elbow's record label.
The lock was one of a record 14 Irish players included in head coach Ian McGeechan's 37-man squad on Tuesday.
State officials expect a record 351, 000 voters to head to polling places to perform their traditional role of clarifying the presidential field.
Rick Pitino, now head coach of Louisville Cardinals, kept a record of deflections while he was an assistant coach more than thirty years ago under NBA coach Hubie Brown then coaching the New York Knicks.
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Herbie Hancock's 1973 classic Head Hunters, the first platinum-selling jazz record, is now considered one of the defining moments in jazz fusion.
Ministry, owned by James Palumbo, son of Lord Palumbo, a former head of the Arts Council, now spans a record company, a magazine, a syndicated radio show, a website on which the club is broadcast live, clothes, and licensed products such as hi-fi equipment.
His record, says the BBC's Jonathan Head, who is in Phnom Penh, is complex and showed many personal flaws.
He returned to La Salle as head coach, guiding the Explorers to a 23-1 record in 1968-69 while the program was on NCAA probation.
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