K'Waun Williams

On February 21, 2017, the San Francisco 49ers signed Williams to a one-year, $615,000 contract with a signing bonus of $75,000. He reunited with San Francisco 49ers' defensive backs coach Jeff Hafley who was his position coach with the Cleveland Browns and at Pitt.

On September 29, 2017, the San Francisco 49ers signed Williams to a three-year, $8.85 million contract extension with $4.25 million guaranteed and a signing bonus of $3 million. On October 1, 2017, Williams collected a season-high eight combined tackles during an 18–15 loss at the Arizona Cardinals in Week 4. Williams was inactive for two games (Weeks 8–9) after injuring his quadriceps. On December 24, 2017, Williams recorded five combined tackles, deflected two passes, and made his first career interception during a 44–33 victory against the Jacksonville Jaguars in Week 16. He intercepted a pass by quarterback Blake Bortles and returned it for a 27-yard gain. He finished the 2017 season with a career-high 54 combined tackles (42 solo), five pass deflections, two forced fumbles, an interception, and a sack in 14 games and five starts. Pro Football Focus gave Williams an overall grade of 80.2, which ranked 44th among all qualifying cornerbacks in 2017.

On August 12, 2016, Williams opted to not participate in the Cleveland Browns' pre-season opener due to an ankle injury. On August 18, 2016, the Cleveland Browns suspended Williams for two weeks and fined him for conduct detrimental to the team. The Browns argued the severity of Williams injury as he continued to sit out practice and received a second opinion. Williams received a second opinion from an independent specialist at the Cleveland Clinic and was told he would have to undergo surgery to remove bone spurs. Williams stated he planned to appeal the suspension and was also reportedly contemplating retirement. On August 29, 2016, the Cleveland Browns waived Williams.

On August 30, 2016, the Chicago Bears claimed Williams off of waivers. However, the contract was voided after Williams failed a physical due to his ankle injury. On November 3, 2016, Williams underwent surgery to remove the bone spurs and was expected to recover within 12 weeks.

Williams was ranked as the 92nd best cornerback prospect in the 2014 NFL Draft by DraftScout.com.

Williams went undrafted in the 2014 NFL Draft, but received offers for a tryout from the Cleveland Browns and Pittsburgh Steelers. Williams declined the offer to attend the Pittsburgh Steelers' rookie camp in order to reunite with Browns' defensive backs coach Jeff Hafley who was also his position coach at Pitt and recruited him out of high school.

On May 20, 2014, the Cleveland Browns signed Williams to a two-year, $930,000 contract.

He made his professional regular season debut in the Cleveland Browns' season-opener at the Pittsburgh Steelers and made three combined tackles in their 30–27 loss. Williams was inserted at nickelback after rookie Justin Gilbert had issues in pass coverage and was replaced on the outside by nickelback Buster Skrine. He made his first career tackle on running back Le'Veon Bell after a nine-yard reception in the third quarter. On October 5, 2014, Williams collected a season-high six solo tackles, deflected a pass, and made his first career sack during a 29–28 victory at the Tennessee Titans in Week 5. Williams sacked backup quarterback Charlie Whitehurst for a six-yard loss in the third quarter. The following week, Williams earned his first career start, as a nickelback, and made a solo tackle and two pass deflections before exiting in the second quarter of the Browns' 31–10 win against the Pittsburgh Steelers in Week 6 due to a concussion. He was inactive for the Browns' Week 7 loss at the Jacksonville Jaguars due to concussion symptoms. In Week 11, he collected a season-high eight combined tackles and a pass deflection during a 23–7 loss to the Houston Texans. Williams was inactive for two games (Weeks 15–16) due to a hamstring injury. He completed his rookie season in 2014 with 38 combined tackles (29 solo), eight pass deflections, and a sack in 13 games and four starts.

In Week 2, he made three solo tackles and sacked quarterback Marcus Mariota during a 28–14 victory against the Tennessee Titans. He was sidelined for two games (Weeks 4–5) after sustaining a concussion. In Week 10, he collected a season-high five solo tackles in the Browns' 30–9 loss at the Pittsburgh Steelers. Williams was inactive for the Browns' Week 15 loss at the Seattle Seahawks due to a shoulder injury. Williams finished the 2015 season with 39 combined tackles (31 solo), two pass breakups, three forced fumbles, two fumble recoveries, and a sack in 13 games and six starts.

Williams played from 2010 to 2013 with the Pittsburgh Panthers.

K'Waun Lamar Williams (/ˈ k eɪ w ɔː n / KAY -wawn; born July 12, 1991) is an American football cornerback for the San Francisco 49ers of the National Football League (NFL). He played college football at the University of Pittsburgh and attended Saint Joseph Regional High School in Montvale, New Jersey. He has also been a member of the Cleveland Browns.