Drouet was left with a broken nose following the incident with Tomic's father in Madrid.
The up-and-coming tennis star Bernard Tomic was born in Germany, of Bosnian and Croatian parents.
Djokovic was playing his second round opener later Wednesday against young Australian Bernard Tomic.
World number 61 Tomic conceded defeat to Hanescu in Paris after suffering a muscle tear in his right hamstring.
"I can't even think what would happen if our Prosek disappears, " Tomic said.
Australia's Bernard Tomic also reached the last four, with the 20-year-old beating veteran Finn Jarkko Nieminen 6-7 (6-8) 6-4 6-2.
He has already put Dragan Tomic, a loyal apparatchik, back as speaker of Serbia's parliament, which makes him acting president.
Meanwhile, home favorite Bernard Tomic built on his shock win over world number one Novak Djokovic by defeating Andreas Seppi.
Murray will play Santiago Giraldo in the third round after the Colombian beat Australia's 25th seed Bernard Tomic 6-4 6-1 6-3.
Tomic Senior has often clashed with Tennis Australia, having previously threatened to switch his son's allegiance to Croatia unless his demands are met.
John Tomic is facing criminal charges after allegedly headbutting his son's training partner Thomas Drouet earlier this month, though he is claiming self-defense.
Tomic's father has often clashed with Tennis Australia, having previously threatened to switch his son's allegiance to Croatia unless his demands were met.
His fellow American Sam Querrey lost to Australia's 19-year-old rising star Bernard Tomic , who will next face Ukrainian 13th seed Alexandr Dolgopolov.
Tomic, who was born in Germany to a Croatian-Australian father and Bosnian-Australian mother, has already predicted he will become the world's number one.
Tomic, Croatia's leading wine expert, said he is trying to help Croatian authorities in their race to protect the Prosek name before EU entry.
"It's just a matter of when and where, and when I grow out of my body, " Tomic told the Melbourne Age last year.
Elsewhere, home favorite Jo-Wilfried Tsonga booked his place in the semifinals of the Marseille Open following a 4-6 6-3 7-6 win over Australia's Bernard Tomic.
Next up for the 17-time grand slam winner is Australian rising star Bernard Tomic , who Federer beat in the fourth round of last year's tournament.
So Tomic is something of a modern-day rarity: an Australian tennis star appearing on the front pages and the back - and for all the right reasons.
Maja Kovacevic Tomic, the court's spokesman, is even happier.
Now at least Australian tennis fans have a new star to root for: 18-year-old Bernard Tomic, who has become the youngest men's player since Boris Becker to reach the quarter-finals of Wimbledon.
Tomic broke into the limelight when he reached the quarterfinals of Wimbledon in 2011 as an 18-year-old but he has also been no stranger to controversy with his father during his short career.
Murray starts his defense of his Shanghai Masters title against Florian Mayer on Wednesday after the German beat Australia's Bernard Tomic 6-4 6-0 in the first round, while Djokovic faces Grigor Dimitrov of Bulgaria.
Tomic's lawyer Carmen Dieguez said the reason that he used his head to attack Drouet was because the tennis player, 29, was holding the coach's arms at the time and that he was acting in self-defence.
The incident continues the mixed career of Bernard Tomic, ranked 53rd in the world, and who was dropped from his Davis Cup side earlier in the year for what Australia captain Pat Cash called a lack of professionalism.
"Prosek is an established brand that has been produced in these areas for more than two thousand years, " Croatian winemaker Andro Tomic said at his Romanesque winery in Jelsa, a picturesque town on the Adriatic island of Hvar.
"Tomic's arrival as a significant force couldn't be better timed for the traditional roaming gang of Australian tennis fans, or 'Earls Court posse', without whom Wimbledon would be... well, a lot less Australian, " writes Giles Smith in The Times.
Remarkably, Tomic is the only Australian player inside the top 100 in the men's world rankings, and while few expect him to win this year's tournament, he has the talent to do so in the not so distant future.
He was also beaten by Bernard Tomic in his singles rubber in the match against hosts Australia, but against Verdasco in the final he showed the form which has kept him at the top of the world rankings for the past two seasons.
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