While exemptions are offered to athletes who medal at the Olympic Games or win gold at the Asian Games, significant achievements on the PGA Tour do not yet warrant an exception.
"I think it was hard to kind of get it close, and obviously, the opportunities on the back nine were 11 - I hit a decent shot into 10 and had a decent look there, but took advantage of 11", Poulter explained.
"I saw it kick off the bank of the bunker and I was a bit anxious at the beginning because I kind of felt that it shot a little too fast", Cabrera Bello said.
Competing against Team United States at the Cup will be the worldwide team, comprising the top 10 global players in the official world ranking.
He finished at 10-under 278 for his second PGA Tour win, three shots better than Ian Poulter (71) and Louis Oosthuizen (73).
He then returned to the Web.com Tour until he locked up his PGA Tour card for the 2015-16 season by finishing 23rd on the 2015 Web.com Tour priority list.
The smart money, if an global player overtook American co-leaders J.B. Holmes and Kyle Stanley, was on veterans such as Poulter, Oosthuizen, Adam Scott (the previous youngest victor, at 23 in 2004) or Masters champion Sergio Garcia.
Australia's world No.3 Jason Day claimed an unwanted record for the worst-ever final round by a defending champion since the Players moved to TPC Sawgrass in 1982, signing for an 80.
Day, who romped to a four-shot victory in 2016, finished at seven over for the tournament. He stuffed his tee shot to 5 feet on the par-3 17th for birdie, and after hooking his tee shot into the water on the 18th, he rolled in a long putt from off the 18th green for par.
The 41-year-old has accepted an invitation to the European Tour's flagship event after bouncing back to form with a share of second place at last week's Players Championship.
"The moment I was leading, I was very confident", he said.
"K.J. has become a really good model, so because he had won before I have I am kind of confident that a Korean can win one of these tournaments and that actually helps me when I'm playing", he added.
Sergio Garcia carded a hole-in-one on the famous par-three 17th in Thursday's opening round.
"After consulting with my team last night and this morning, I have chose to withdraw from this week's AT&T Byron Nelson".
World number one Dustin Johnson carded a final round 68 to finish tied for 12th while number two Rory McIlroy ended with a 75 to drop to equal 35th.
The other co-leader was J.B. Holmes, and it was a horror show for the Kentuckian.