Here's a short story:

(CNN)Fine starts to 2015 for world number one Rory McIlroy and his arch-rival Rickie Fowler, a superb 64 from first round leader Martin Kaymer and aces for England's Tom Lewis and Spanish veteran Miguel Angel Jimenez. 

The first day of the HSBC Abu Dhabi Championship Thursday was nothing but eventful as a top class field jostled for position at the top of the leader board. 

Most eyes were on the partnership of McIlroy and his American rival Fowler, teeing off early at Abu Dhabi GC, and they did not disappoint, both carding five-under rounds of 67. 

But last year's U.S. Open champion Kaymer, a three-time winner at the venue, later upstaged them with a blistering eight-under 64, which included 10 birdies, a personal best for him, he told the official European Tour website. 

"I putted well. I made 10 birdies. I'm not sure if I have ever done it on a golf course, hit 10 birdies. I hit a lot of fairways, my irons were quite sharp and I putted well. It's very difficult to shoot a bad score when you play like this. 

His late charge denied Belgium's Thomas Pieters (65) the honor of first day leadership, while there was a five-strong group on 66, consisting of Branden Grace, Gregory Bourdy, Tyrell Hatton, Alexander Levy and Mikko Ilonen. 

McIlroy, looking to add to his two majors of last year in 2015, made a slow start but a rally on his back nine, with five birdies in six holes, left him in a challenging position.  (End of story)

Provide your best guess for the following question. Give ONLY the guess, no other words or explanation.

For example:

Guess: <most likely guess, as short as possible; not a complete sentence, just the guess!>

Here are a few examples of questions and answers:

Question: What was Thursday?
Guess: HSBC Abu Dhabi Championship

Question: Which match were most people watching?
Guess: McIlroy and his American rival Fowler

Question: What did they score ?
Guess: 67

Question: Who is Kaymer?
Guess: last year's U.S. Open champion

Question: How many birdies did he get?
Guess: 10

Question: What was his score?
Guess: 64

Question: How did he think he putted?
Guess: well

Question: What is McIlroy hoping to do?
Guess: add to his two majors

Now answer the following question in the same format.

Question: when did he win those?

last year