This is an article in French about the Australian Open, with a heavy focus on the 1983 Australian Open:
It includes the following (translated) excerpts, including some quotes from Wilander:
'In this year 83, it is the Grand Prix which will be at the origin of the renewed interest in the Australian Open: the final winner of the ranking will receive a bonus of 600,000 dollars. A colossal sum at the time.'
“
Let's be honest, that's why me, John (McEnroe) or Ivan (Lendl) came ,” smiles Mats Wilander.
The year before, no one came. $600,000 was huge ." There are still four at the end of the 1983 season who can claim first place in the Grand Prix: McEnroe, Lendl, Wilander and Connors. "
Only Jimmy didn't come, he was the big absentee but overall, the general impression was that everyone was there, which hadn't happened at the Australian Open since... maybe- "I don't know exactly what it was like in the 50s or 60s, but there was a different feeling there ,"
''
Well, I would have gone to Australia anyway since there was the Davis Cup final, but if I played the Australian Open, it It was mainly for this bonus of 600,000 dollars which, I admit, made the 19 year old kid that I was drool a little ."
'If I'm honest ," he said, "
even playing it in '83, we didn't quite have the feeling of playing a Grand Slam. It became that way over the years. When we got to '83, for for us, it was a bit like Miami or Indian Wells. A big thing but without the prestige of Roland-Garros, Wimbledon or the US Open. It took a while for the 'Australian' to make up for the lost years. "
LES GRANDS RÉCITS - Longtemps, l'Open d'Australie, déserté par les meilleurs joueurs du monde, a été le parent pauvre du Grand Chelem.
www.eurosport.fr
Unsurprisingly money was a factor.
Mac mentioned that he was paid guarantees to play at the Australian Open on a few occasions, and I wouldn't be surprised at all if that was the case in 1983. There was a lot of commotion about a pregnant Goolagong receiving guarantees to play at the tournament in 1980, which really irked Turnbull. Plus the fact that the USA team weren't competing in the Davis Cup final that year, unlike in 4 out of the 5 previous years, could well have been a factor.
The 1983 final between Wilander and Lendl, while still a meaningful result, didn't really have the feel of a big grand slam final. Lendl's comments afterwards that he would see if he could fit the tournament into his schedule the next year, were mostly likely code speak for 'I'll only be back next year if I'm paid enough'. However by 1987 Lendl rated the Australian Open as important - after losing to Mecir in the Miami final, he said that the only significant tournament so far that season was the Australian Open. And Miami still awarded greater prize money and more ranking points at the time, plus had a larger draw size.
During the first week of the 1982 Australian Open, McEnroe, Lendl and Wilander were instead playing in the first edition of the ECC in Antwerp, which offered considerably greater prize money and at times was billed as the biggest indoor tournament in the world. Antwerp was held 2 weeks earlier in 1983 compared to 1982 so preventing a similar clash, with Mac and Lendl playing in both tournaments.
Also in 1982 the Sydney indoor tournament in mid-October had Mac, Connors, Gerulaitis and Mayer, an invitational tournament in Melbourne straight after had Lendl, Gerulaitis and Mayer (Connors was injured and withdrew), an invitational tournament in Perth in early November had Mac, Borg, Lendl and Gerulaitis, and an invitational tournament straight after in Sydney (the AKAI Gold Challenge with best of 5 set matches across the board) had those same 4 players (Vitas replaced Connors who withdrew). However the Australian Open which started at the end of November had none of those players in the draw. The fact that those players were willing to travel down to Australia during the year to play in tournaments, but not the Australian Open itself, was very telling. So clearly something had to be done, and better money / guarantees / bonuses was unsurprisingly an effective solution.