Serena mentor says won't do any on-court coaching

'I feel that a lot of people would like on-court coaching, most of the players would like it also, because they like to exchange with their coach.'

Serena Williams's coach Patrick Mouratoglou expects on-court coaching to continue virtually unchecked at the Grand Slams despite the furore during last year's US Open final when he attempted to guide her mid-match.

Mouratoglou gestured to Williams in the stands during her tempestuous defeat by Japan's Naomi Osaka at Flushing Meadows, leading to a code violation and sparking a heated row between the American great and the chair umpire.

Williams, who denied seeing Mouratoglou's signalling, was incensed at the official's strict interpretation of the rule and said post-match that she felt a victim of sexism.

The Australian Open has followed the US Open's lead by trialling on-court coaching during qualifying this year but the practice remains banned for the main draw events starting Monday.

Mouratoglou, however, believes the rule will remain patchily enforced at Melbourne Park and the other three Grand Slams, and coaches will not feel extra pressure to comply.

"As you know, 99 percent of the matches it's tolerated," Mouratoglou said at Melbourne Park on Thursday.

"It's something that people don't even think about it, just do it every match. And it doesn't make any problem.

"If it becomes really, really obvious, (umpires) will call the player or tell her: 'the coach is really coaching too much, can you ask him to slow down otherwise I will have to give you a warning.' Everybody's careful and it's fine.

"So I don't see any stress from players or coaches with coaching during the matches, to be honest."

Mouratoglou was speaking after promoting "Tennis Manager 2019", an app-based game that he helped create with French developer Rebound CG.

The game seeks to tap into the popular sports management simulator niche, which has spawned big-selling titles like the "Football Manager" series for soccer and "Out of the Park Baseball".

Pointedly, "Tennis Manager" allows gamers to conduct on-court coaching to the tennis players they "manage" in their simulations to seek an edge during matches.

Mouratoglou expects to see the practice eventually legalised at the real-world Grand Slams, which he felt would improve "the show" and help stoke interest among younger fans.

However, the Frenchman is not holding his breath.

"It's very difficult for the tennis reigning bodies to make change because this sport is very conservative so it will have to go step by step," he said.

"But I see progress. I feel that a lot of people would like on-court coaching, most of the players would like it also, because they like to exchange with their coach and they feel it would add (something) during the match."

Ironically, Mouratoglou said he and Williams had decided not to do any on-court coaching, even at the tournaments on the professional women's WTA circuit where it is permitted.

"It's not that she doesn't want (it)," he said of 37-year-old Williams, who is bidding for a record-equalling 24th Grand Slam title and eighth at Melbourne Park after missing last year's tournament while on maternity leave.

"I think her number one quality is to be the best competitor ever, and I don't want to think that suddenly she needs someone to be a better competitor. That would make her weaker.

"So for me, it doesn't make sense for someone like her."