Tiger Woods is now the second favourite for the Masters.
Els, a four-time major victor, takes over from Nick Price who has guided the Internationals at the last three Presidents Cups.
A phone message left by Morning Read with a PGA Tour official who has responsibility for administering the biennial Presidents Cup was not returned.
Els will take over the worldwide lead reins from Zimbabwean Nick Price.
Also the announcement of Woods as the 2022 USA Captain will be a huge boost to the Presidents Cup that has suffered for many years given the USA side has won 10 of 12 events since the inaugural tournament in 1994. They spoke on condition of anonymity because the captain selections have not been announced.
Bookmakers Neds have Woods at $7 to win at Bay Hill for an incredible ninth time, ahead of Day at $13.
"The Presidents Cup is owned by the PGA Tour, but we have to be more in control", Els said.
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Woods, who was an assistant captain last year when sidelined with back problems and will fill a similar position this year when the USA take on Europe in the Ryder Cup in France, could find himself filling the role of playing the captain in Australia.
Els and Woods matched par on the first extra hole. In gathering darkness that made it hard to read putts, Woods holed a double-breaking, 15-foot par putt on the third extra hole.
When it was too dark to continue, and both teams on the green were debating what to do, captains Jack Nicklaus and Gary Player agreed to share the cup. Els said it was the first time he felt his legs shake over a putt.
It prompted four-time major victor Els, an assistant captain to Nick Price in NY, to call for sweeping changes ahead of the showpiece in Melbourne.
In 1998 in Thailand, Woods rallied from an eight-shot deficit in the final round and beating Els in a playoff.
The 2019 matches will be December 12-15 at Royal Melbourne, the latest the Presidents Cup has been played.
So, expect some type of format change to reduce the number of points from 30 and minimize the American depth, plus perhaps other tweaks for which Els has lobbied.
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