Question: Which court is more narrow, singles or doubles?
About the article "Badminton", section "Singles".

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This is a list of the main career statistics of Australian former tennis player Margaret Court.
Court won 62 Grand Slam events (24 singles, 19 doubles, 19 mixed doubles), which is a record for a male or female player.
Her 24 Grand Slam singles titles and 19 in mixed doubles are also all-time records across both sexes.
She achieved a career Grand Slam in singles, doubles and mixed doubles, is one of two women to have achieved "the" Grand Slam in singles in the Open Era (alongside Steffi Graf), and is the only woman to have achieved the mixed doubles Grand Slam, which she did twice.
Court won more than half of the Grand Slam singles tournaments she played (24 of 47) She won 192 singles titles before and after the Open Era, an all-time record.
Her career singles win-loss record was 1,177-106, for a winning percentage of 91.74 percent on all surfaces (hard, clay, grass, carpet), is also an all-time record.
She won at least 100 singles matches in 1965 (113-8), 1968 (107-12), 1970 (113-6), and 1973 (100-5).
She won more than 80 percent of her singles matches against top 10 players (297-73) and was the year-end top ranked player seven times. 
 & national teams.
Successful players.
Several players have won gold medals in more than one category in a World Championship; this includes:  Lene Køppen, 1977, mixed doubles and women's singles  Christian Hadinata, 1980, men's doubles and mixed doubles  Park Joo-bong, 1985, men's doubles and mixed doubles, 1991, men's doubles and mixed doubles  Han Aiping, 1985, women's singles and doubles  Ge Fei, 1997, women's doubles and mixed doubles  Kim Dong-moon, 1999, men's doubles and mixed doubles  Gao Ling, 2001, women's doubles and mixed doubles From 1977 up to 2001, the medals were usually divided among five countries, namely China, Korea, Denmark, Indonesia, Malaysia.
However, in 2003, the winners included seven countries and in 2005 the medal board contained a record high of ten countries.
Tony Gunawan also bears the distinction of winning a gold medal in Men's Doubles, representing two different countries, 2001 partnering with Halim Haryanto for Indonesia and in 2005 partnering with Howard Bach to give the United States its first medal in the competition.
The 2005 edition also brought new faces in the mixed doubles event which had been dominated by China and Korea since 1997.
With the retirement of defending champions and two time winners Kim Dong-moon/Ra Kyung-min (Korea), Nova Widianto/Lilyana Natsir won Indonesia's first mixed doubles gold since 1980 when Christian Hadinata/Imelda Wiguna won it last for Indonesia.
Below is the list of the most successful players ever, with 3 or more gold medals.MS: Men's singles; WS: Women's singles; MD: Men's doubles; WD: Women's doubles; XD: Mixed doubles 
Though strategy is important in singles, it is even more important in doubles.
The additional width of the alleys on the doubles court has a great effect on the angles possible in doubles play.
Consequently, doubles is known as a game of angles.
There are three basic doubles strategies:  both-up strategy (also called "two-up" strategy)  up-and-back strategy (also called "one-up/one-back" or "I" strategy)  both-back strategy (also called "two-back" strategy)  
Players are divided into two teams and wait with one team behind each baseline.
One player from each team steps up and a singles point is played out starting with a drop hit.
The person that wins adds another player from their team to the court while the player that loses goes to the end of their line and a new player replaces him or her.
This next point is played one vs. two with the team with only one person on the court starting the ball.
The team with one person on the court can use the doubles court while the team with multiple people on the court has to use the singles court.
If the team with two people on the court wins, they add another player and play one vs. three.
If they lose, all players on the court on that team go to the end of the line and one player replaces them.
The other team, the winning team, adds another player to the court.
If playing against one player, singles court must be used.
If playing against two or more players, doubles court can be used.
The game continues until an entire team is on the court and wins the point.
This game is designed to practice ball placement. 
Singles involves two players competing against each other, usually two men or two women, although games between a man and a woman may be played on an informal basis.
Doubles is played by two players of two teams each, most often all-male or all-female.
It utilizes a wider court than singles matches: it includes the area in the alley (tramlines, in British terminology), whereas singles does not.
The two players on the receiving side change positions after each point played (one at the net and the other near the baseline, preparing to return serve).
Mixed doubles is played the same as doubles, but with one man and one woman per team.
This form of tennis is rare in the professional game because the men's and women's tours are organised separately (by the ATP and WTA, respectively).
However, all four Grand Slam tournaments hold a mixed doubles competition, alongside the men's and women's doubles, and featuring many of the same players.
There is also an annual mixed tournament for national teams, the Hopman Cup, which includes mixed doubles.
Additionally, tennis at the 2012 Summer Olympics included a mixed doubles event for the first time since tennis returned to the Olympic Games in 1988.
In professional tennis tournaments such as Wimbledon, the singles competition receives the most prize money and coverage, followed by doubles.
Mixed doubles usually receive the lowest monetary awards.
Also while players are gradually less competitive in singles by their late 20s and early 30s, they can still continue competitively in doubles, such as Martina Navratilova and John McEnroe, who won doubles titles in their 40s.