In 2015, which Grand Slam tournament did Serena Williams not win?
 US Open
Australian Open
Wimbledon
Australian Open
Wimbledon
Wimbledon
Australian Open
Wimbledon
Wimbledon
French Open
Wimbledon
Australian Open
Wimbledon
Wimbledon
French Open
Wimbledon
Australian Open
Wimbledon
U.S. Open
US Open
Wimbledon
French Open
BNP Paribas Open
Australian Open
Roland Garros
Wimbledon
US Open
Wimbledon
U.S. Open
Roland Garros
BNP Paribas Open
French Open
Wimbledon
Australian Open
Roland Garros
Wimbledon
Wimbledon Championships
US Open
U.S. Open
BNP Paribas Open
Wimbledon
Roland Garros
French Open
Wimbledon
Australian Open
Indian Wells Masters
Wimbledon Championships
Australian Open, French Open
Roland Garros
Wimbledon
US Open
U.S. Open
Wimbledon Championships, Australian Open
Wimbledon
Australian Open, Australian Open
French Open
Indian Wells Masters
Wimbledon Championships
Roland Garros
BNP Paribas Open
Australian Open
Wimbledon
French Open, Australian Open
US Open, Australian Open
WTA Finals
Open GDF Suez
Wimbledon Championships, Australian Open
WTA Tour Championships
U.S. Open
Roland Garros
BNP Paribas Masters
US Open
Indian Wells Masters
Wimbledon Championships
Wimbledon, Australian Open
French Open
WTA Finals
Australian Open, French Open
Royal Bank of Scotland Championships
Open GDF Suez
BNP Paribas Open
WTA Tour Championships
Roland Garros
Australian Open
WTA Championships
BNP Paribas Masters
U.S. Open
Wimbledon Championships, Australian Open
Wimbledon, Australian Open
Wimbledon Championships, French Open
Indian Wells Masters
Wimbledon Championships
Open GdF Suez
Queen's Club Championships
US Open
The Australian Open
Roland Garros
WTA Tour Championships
BNP Paribas Open
Australian Open, Wimbledon
Australian Open, Australian Open
WTA Finals
BNP Paribas Masters
Wimbledon, Australian Open, Wimbledon
Royal Bank of Scotland Championships
French Open
Wimbledon, Australian Open
WTA Championships
U.S. Open
Wimbledon Championships
Wimbledon Championships, Australian Open
Open GdF Suez
Australian Open
US Open, Australian Open
The Australian Open
WTA Tournament of Champions
Roland Garros
Indian Wells Masters
BNP Paribas Open
Australian Open, French Open
Royal Bank of Scotland Masters
BNP Paribas Masters
WTA Finals
Wimbledon, Australian Open
US Open
Wimbledon, Wimbledon, Australian Open
WTA Championships
U.S. Open
The Australian Open
Wimbledon Championships
Roland Garros
Wimbledon, Australian Open, Wimbledon
Wimbledon Championships, French Open
WTA Tour Championships
Royal Bank of Scotland Tennis Tournament
WTA Tournament of Champions
French Open
Australian Open, Wimbledon
Indian Wells Masters
Royal Bank of Scotland Championships
Open de France
BNP Paribas Open
Australian Open
BNP Paribas Masters
Royal Bank of Scotland Masters
Indian Wells
Queen's Club Championships
Australian Open, Australian Open
WTA Finals
Wimbledon, Australian Open
Royal Bank of Scotland Tennis Classic
Wimbledon Championships, Australian Open
Wimbledon, French Open
Roland Garros
U.S. Open
WTA Championships
WTA Tour Championships
WTA Tournament of Champions
The Australian Open
Royal Bank of Scotland
Wimbledon Championships
US Open
Royal Bank of Scotland Tennis Tournament
US Open, Australian Open
WTA Tournament of Hearts
Australian Open, French Open
BNP Paribas Open
BNP Paribas Masters
Royal Bank of Scotland Masters
Royal Bank of Scotland Ladies Masters
Open de France
Wimbledon, Australian Open
French Open
Roland Garros
Indian Wells
Indian Wells Masters
Australian Open, Wimbledon
WTA Finals
Sony Ericsson Championships
Wimbledon Championships, French Open
U.S. Open
Wimbledon Championships
Royal Bank of Scotland
Australian Open
Royal Bank of Scotland Tennis Classic
Wimbledon Championships, Australian Open
WTA Championships
The Australian Open
WTA Tour Championships
WTA Tournament of Champions
WTA Tournament of Hearts
Open de France
BNP Paribas Masters
Royal Bank of Scotland Tennis Tournament
Wimbledon, Australian Open
Roland Garros
Royal Bank of Scotland Ladies Masters
US Open
U.S. Open
Indian Wells
Open de Limoges