Shane Lowry is aiming to become only the sixth golfer to secure consecutive Open Championships when the 149th edition tees off at Royal St George's on Thursday.
Despite missing four successive Open cuts, outsider Lowry produced a stunning display in 2019 to win the Claret Jug by six shots.
Now, speaking exclusively to Planet Sport, gingerbets.com's Jack Kelliher picks out the major dangers to Lowry's hopes of retaining his crown.
And despite Brooks Koepka having already voiced his dissatisfaction at the set-up of Royal St George's, Kelliher says he still holds more appeal than tournament favourite Jon Rahm.
Kelliher said: "First up, the man from America, the four-time Major winner himself, Brooks Koepka. Available at 16/1 - eight places with Planet Sport Bet - he is a standout bet for me this week.
"Double the price of the favourite Jon Rahm, you cannot go wrong. Brooks a four-time Major champ, Rahm just the one in the bag."
While Kelliher doesn't discount the chances of a back-to-back champion, he has more faith in 2019 victor Lowry delivering than 2020 US Open winner Rahm.
"The talk is about Rahm going back-to-back in Major Championships," he said.
"This week, though, I'm predicting that Shane Lowry has the opportunity to go back-to-back Open champion.
"He is 40/1. He's my second selection of the week. An extremely good wind player and an extremely good player in difficult tracks and conditions. He is sure to go close."
Kelliher also highlighted the claims of two Americans, Patrick Reed and Will Zalatoris.
Reed has been paired with Australian No. 1 Cameron Smith for the first time since the two were involved in rules controversy at the Australian Open in 2019, while Zalatoris is playing his first Open Championship.
Nevertheless, Kelliher believes they both hold excellent each-way claims.
Speaking of Reed, he said: "He's got a top 10 in 2019 at The Open Championship, he'll be looking to go nine places better and get his second Major in the bag this week."
Zalatoris, meanwhile, despite his inexperience, has already got form at Majors having finished second at Augusta.
"He's a young gun, he is a player that plays in the wind really well on the PGA TOUR.
"He's available at 75/1 and has three top 10s in five Majors so far."
For his final selection, Kelliher has picked out another 24-year-old, Collin Morikawa, winner of the 2020 PGA Championship.
"I cannot believe the price of this guy."
Morikawa can be backed at 35/1 with Planet Sport Bet, who are paying out each way to eight places.