(CNN) -- Tiger Woods faces two challengers as he bids to retain the world's No. 1 golf ranking for a 271st week at the WGC-Bridgestone Invitational starting in Ohio on Thursday. 

The 34-year-old has been at the summit for an unprecedented 612 weeks in total, but once again faces the prospect of losing top spot to fellow American Phil Mickelson -- and a new contender, world No. 3 Lee Westwood. 

While second-ranked Mickelson has failed to take advantage of Woods' struggles in recent weeks, finishing only tied for 48th at the British Open, Westwood has racked up the points after placing second at his home major last month. 

The Englishman can go to No. 1 if he wins at Firestone and Woods is outside the top two -- or if he is second, the defending champion is 10th or lower and Mickelson does not win. 

Mickelson can finally surpass Woods if he wins, or if he finishes in the top four and his compatriot is outside the top 37. 

"Am I conscious of the pack closing in? Yes, because every tournament you guys remind me," Woods told reporters on Wednesday ahead of his bid for an eighth title in the event. 

"You play. How I got here was playing golf tournaments and winning golf tournaments." 

Woods will partner Westwood for the first two rounds in Akron, knowing that his rival has finished second in two majors this year and was runner-up at Firestone behind Vijay Singh in 2008. 

"I've always enjoyed playing with Westy, he's a great guy. We've been going at it for a long time," he said of the 37-year-old, who he also played with at the U.S. Open in June.  QUESTIONS:

Q1:
1. What does Phil Mickelson have to win to become world No. 1?
2. By which means can Phil Mickelson become world No. 1 ?
3. 
Q2:
1. Has Phil Mickelson taken the advantage of the opportunity?
2. Was Phil Mickelson able of taking the best out of the opportunity?
3. 
Q3:
1. How come Phil Mickelson wasn’t able to take advantage of the opportunity?
2. Why wasn’t Phil Mickelson able to take advantage of the opportunity?
3. 
Q4:
1. What other person is in the running?
2. Which other person is in the running?
3. 
Q5:
1. Who else is in the running besides Woods?
2. Is anyone else in the running other than Woods?
3. 
Q6:
1. What is the name of the other person in the running besides Woods?
2. Which person is also in the running other than Woods?
3. 
Q7:
1. Where does Lee Westwood come from?
2. What country Is Lee Westwood from?
3. 
Q8:
1. What is the event that starts on Thursday?
2. What is the name of the event that will take place on Thursday?
3. 
Q9:
1. Where will the event take place?
2. In what state will the event be held?
3. 
Q10:
1. In what city will the event be held?
2. What city will host the event?
3. 
Q11:
1. By which means can Westwood become No. 1?
2. What can make Westwood become No. 1?
3. 
Q12:
1. Who will play with who on the first two days?
2. Which people will be playing together on the first two days?
3. 
Q13:
1. What is Tiger’s age?
2. How many years old is Tiger?
3. 
