Introduction: Almost all shoulder injuries in competitive swimmers occur at a rate of 4-91%. Supraspinatus tendinopathy (also known as tendinosis or tendinitis) can be career-threatening. There are many competing views on the efficacy of physical therapy modalities, including instrument-assisted soft tissue mobilization (Graston technique) for soft tissue functional recovery after tendon injury through refinement. Aim of Study: To evaluate the impact of Graston technique on functional abilities and pain intensity in competitive swimmers with chronic supraspinatus tendinopathy. Material and Methods: Forty participants were enrolled from the Outpatient clinic of Al-Ahly Sporting Club, both genders were randomized into two groups of equal number after assigned consent forms; Group A: had received the Graston technique over the myofascial fascia of the trapezius upper fibers, plus traditional physiotherapy program. While group B: had received a traditional physiotherapy program, only. The study protocol consists of 45 minutes repeated three sessions a week for four weeks. All participants` data regarding the Arabic version of the Disabilities of Arm, Shoulder and Hand Questionnaire (DASH) and Visual Analogue Scale (VAS), at the study baseline and by study protocol end, were tabulated and then statistically analyzed. Results: The findings revealed statistical substantial differences among groups concerning DASH and pain intensity (P<0.05) to word the study group. Conclusion: Adding the Graston technique to conventional therapy is an effective therapeutic modality to improve functional abilities and decrease pain intensity in competitive swimmers with chronic supraspinatus tendinopathy.