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FLUSHING, N.Y. — Esurance, the direct-to-consumer personal car insurance company, is helping enhance the US Open experience for fans and attendees over the next two weeks by providing them with a number of engaging elements onsite at this year’s event.

Visitors to the Esurance booth at the US Open will get an Esurance-branded hangtag to wear while they’re at the event, making them eligible to receive promotional items. Esurance “spotters” will roam the tournament grounds giving away items such as US Open gift cards, rain ponchos, seat cushions, lip balm, and sunscreen to the hangtag wearers.*

Esurance is again supporting the US Open’s Green Initiative, promoting the use of public transit by giving away MetroCards throughout the tournament in conjunction with the USTA. Each day, representatives will hand out cards at the Esurance bag-check station on the walkway between the subway and the USTA Billie Jean King National Tennis Center. Attendees can also pick up MetroCards at the Esurance booth and from US Open Guest Services ambassadors.*

US Open visitors will be able to participate in a wide variety of activities at the Esurance Booth located on the south side of Arthur Ashe stadium, near Court 13.

Fans can collect player autographs during select sessions, and have their pictures taken in front of a life-size photo board of the Bryan Brothers to download or share with friends and family on Facebook and Twitter. The Esurance booth also features touch-screen kiosks that allow visitors to navigate between different offerings:

Esurance has evolved the car insurance experience for consumers by using the latest technology to make shopping for and managing a policy fast and easy:

*Available only while supplies last.

** NO PURCHASE NECESSARY TO ENTER OR WIN. A PURCHASE WILL NOT INCREASE YOUR CHANCES OF WINNING. Open to residents of the 50 US/DC 18 or older at time of entry. Void where prohibited. Sweepstakes began at 12:01 a.m. PT on 6/30/11. Online entries must be received by 11:59 p.m. PT on 9/30/11; mailed entries must be received by 10/7/11. Odds of winning depend on number of entries received. WINNER MUST TRAVEL ON SPONSOR-SPECIFIED DAYS OR PRIZE MAY BE FORFEITED. MEETING WITH BRYAN BROS SUBJECT TO AVAILABILITY. ARV of grand prize: $4,250. Subject to full official rules atwww.esurance.com/tennis/rules.pdf. Sponsor: Esurance Insurance Services, Inc., 650 Davis Street, San Francisco, CA 94111.

About Esurance®

Esurance, a subsidiary of White Mountains Insurance Group, Ltd. (NYSE: WTM), provides personal auto insurance direct to consumers online and through select agents, including sister company, Answer Financial. Esurance is dedicated to constantly improving the way people shop for, buy, and manage their auto insurance. By combining the best of technology with industry know-how, Esurance is able to offer hassle-free coverage with 24/7 customer service and claims handling at competitive prices.

Through Esurance’s website, www.esurance.com, customers can get instant car insurance quotes, view comparison quotes, buy an Esurance policy, and print their insurance cards— all in minutes. Esurance also offers policyholders the ability to make policy changes and file claims instantly online, demonstrating its commitment to improving the entire insurance process from quote to claim.

Answer Financial, also a subsidiary of White Mountains, is one of the largest independent personal lines insurance agencies in the country. Answer Financial offers comparison quotes and provides auto and property insurance from more than a dozen top-rated insurance companies through its website, www.answerfinancial.com, and over the phone. In May 2011, White Mountains announced that it signed a definitive agreement to sell Esurance and Answer Financial to The Allstate Corporation (NYSE: ALL), the nation’s largest publicly held personal lines insurer. The transaction is subject to regulatory and other customary closing conditions, including review by antitrust authorities and state regulators, and is expected to close in the fall of 2011.

SafeHarbor Statement under the Private Securities Litigation Reform Act of 1995

This press release may contain “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934. All statements, other than statements of historical facts, included or referenced in this release which address activities, events or developments which we expect or anticipate will or may occur in the future are forward-looking statements. The words “will,” “believe,” “intend,” “expect,” “anticipate,” “project,” “estimate,” “predict” and similar expressions are also intended to identify forward-looking statements. These forward-looking statements include, among others, statements with respect to White Mountains’:

These statements are based on certain assumptions and analyses made by White Mountains in light of its experience and perception of historical trends, current conditions and expected future developments, as well as other factors believed to be appropriate in the circumstances. However, whether actual results and developments will conform to our expectations and predictions is subject to a number of risks and uncertainties that could cause actual results to differ materially from expectations, including: