Back designs have had a special place in women’s tennis fashion, as sports apparel companies strive to create outfits that look striking both from the back and from the front. The sky’s the limit when it comes to the variety of styles and in this overview Marija Zivlak of Women’s Tennis Blog will show you those that marked 2015.

Half-moon keyhole cutouts at center back are a simple, yet highly visually appealing element popular among many top brands. Here we can see the adidas by Stella McCartney representatives Flavia Pennetta and Garbiñe Muguruza rocking it at the US Open, Serena Williams’ day and night Nike dresses in New York featured a similar back detail, as well as Lacoste’s collection for Roland Garros, as seen here on Alizé Cornet. The adidas Winter Stella McCartney Tank also includes a nice yellow zipper entry at racerback, while Williams’ Nike Fall Premier Dress has a bonded zipper.

Players usually opt for white dresses solely at Wimbledon, but Sloane Stephens occasionally wore them even during other parts of the season, using the power of outstanding back designs to make her plain white pieces stand out.

The most extraordinary feature of Agnieszka Radwanska’s lace dresses was this mesh lace accent at back. Lotto took the risk by incorporating lingerie elements to a great extent and it turned out to be a big hit.

Stella McCartney and adidas made fashion statements with these large egg-shaped back cutouts Caroline Wozniacki and Andrea Petkovic displayed early in the season.

Criss-cross straps are a common type of back design. Ana Ivanovic’s adidas Fall All Premium Dress for Wimbledon has spaghetti straps at two levels, Agnieszka Radwanska’s Lotto Lux Metallic Dress also has them, while the neat black straps of Jelena Jankovic’s Fila Fall Platinum Cami Tank have an added functionality of being adjustable. Venus Williams’ EleVen Kaleidoscope Tie It Up Tank has a surprise detail, a lightly sewn tie at the meeting point of the straps.

Complimenting her chic and feminine colorful prints, Venus Williams created a number of back designs with triangular, circular or square keyhole cutouts highlighted by a variety of elements in them.

Serena Williams sported many bold back designs in 2015, the most fascinating one being that of her Australian Open dress. Thin racerback or skinny straps that meet at upper back were a common feature in Williams’ tops, while in Melbourne the American went for the provocative backless tunic.

Maria Sharapova’s Nike French Open dress had a nice T-back design, while Caroline Wozniacki’s adidas Fall Stella McCartney Dress for Wimbledon used somewhat similar straps, just in reverse position.

In their popular spring/summer clothes, adidas featured these sheer mesh inserts on back, accentuated by the contrasting bra and shorts underneath, while Alizé Lim and her clothing sponsor Le Coq Sportif stood out with see-through backs of these unique jumpsuits.