Here's a short story:

(CNN) -- Dealing with Merion is turning out to be tough enough. But Tiger Woods is also battling an injury at the U.S. Open in Pennsylvania. 

Woods revealed that he hurt his left arm while winning The Players Championship last month, which would explain why he grimaced noticeably on several occasions in the first round. 

The world's top-ranked golfer was back in action in the second round Friday and shot a level-par 70 to complete two rounds at three-over-par 143. 

Asked to provide more details about injury, Woods didn't elaborate. 

"Well, it is what it is," Woods said. 

Woods is bidding to win his 15th major but first since 2008 at the U.S. Open at Torrey Pines. 

Back then he had to deal with seemingly a more serious injury -- a broken leg. He memorably beat Rocco Mediate in a playoff. 

Given the challenging conditions at Merion, Woods suggested his total might not be so bad heading into the final two rounds. 

Storms caused delays of more than four hours Thursday -- Woods had to complete his first round Friday -- and play was eventually suspended due to darkness. Windy conditions added to the degree of difficulty at Merion's shorter East Course. 

Woods, Rory McIlroy and Masters winner Adam Scott made for a dream pairing and while Scott struggled, Woods and McIlroy -- the second-ranked golfer -- fared better. 

Seen chatting amicably during the round, the duo compiled identical scores in the first two rounds. 

Beginning at the 11th hole, Woods birdied the 13th for a good start. Two bogeys, however, on the 14th and 18th, meant he had work to do on the first nine.  (End of story)

Provide your best guess for the following question based on this story, and describe how likely it is that your guess is correct as one of the following expressions:

Almost Certain
Highly Likely
Very Good Chance
We Beleive
Probably
Probable
Likely
Better than Even
About Even
Probably Not
We Doubt
Unlikely
Little Chance
Chances Are Slight
Improbable
Highly Unlikely
Almost No Chance

Give ONLY the guess and your confidence, no other words or explanation. For example:

Guess: <most likely guess, as short as possible; not a complete sentence, just the guess!>
Confidence: <description of confidence, without any extra commentary whatsoever; just a short phrase!>

Here are a few examples of questions and answers:

Question: Who is the highest ranked golfer?
Guess: Tiger Woods
Confidence: <appropriate level of confidence in this guess>

Question: During what championship did he injure himself?
Guess: The Players Championship
Confidence: <appropriate level of confidence in this guess>

Question: What body part did he injure?
Guess: His arm
Confidence: <appropriate level of confidence in this guess>

Question: Which one?
Guess: Left
Confidence: <appropriate level of confidence in this guess>

Question: What major is he attempting to win?
Guess: U.S. Open
Confidence: <appropriate level of confidence in this guess>

Question: How many would that total in his career?
Guess: 15
Confidence: <appropriate level of confidence in this guess>

Question: How long has it been since he has won one at Torrey Pines?
Guess: Since 2008
Confidence: <appropriate level of confidence in this guess>

Question: Was he injured then, too?
Guess: Yes
Confidence: <appropriate level of confidence in this guess>

Question: Which body part was injured back then?
Guess: Broken leg
Confidence: <appropriate level of confidence in this guess>

Question: When did storms cause delays?
Guess: Thursday
Confidence: <appropriate level of confidence in this guess>

Now answer the following question in the same format.

Question: What caused a delay on Friday?

Darkness