Soccer is one of the most extensively analyzed sports, which requires from team and player the high quality of technical, tactical and physical performance, most of the research done on performance analysis in soccer is of an applied nature, based on observational research. Its final objective is to enhance player's and teams' performance by providing knowledge which has meaning within the specific context of competition or training. In order to increase the success probability, performance analysis provides the coach and player with information about past performances and may be useful also in generating data for predictive model development. However, there exist still some limitations that need to be considered in the future research, for example: lack of situation and interaction context in which such performances happen; lack of operational definitions and conflicting classifications of activity or playing positions that make it difficult to compare similar group of studies. In order to solve these issues, the following five independent and correlated studies were undertaken in this PhD thesis. The first study (Chapter 2) aimed to identify the key physical and technical performance variables related to team quality in the 2014 Chinese Super League (CSL). Team's performance variables were collected from 240 matches and analysed via analysis of variance among end-of-season-ranked groups and multinomial logistic regression. The results indicated significant physical performance differences among groups were identified for sprinting (top-ranked group vs. upper-middle-ranked group) and total distance covered without possession (upper and upper-middle-ranked groups and lower-ranked group). For technical performances, teams in the top-ranked group exhibited a significantly greater amount of possession in opponent's half, number of substitutes (n=258). All match performances were analysed using student t-test for independent samples (groups i and ii) and paired samples t-test (group iii). The results showed that for all five playing positions substitutes covered greater distance running than starters. Additionally, the starters were more successful than substitutes in technical performances (e.g. FWD passes success and passes success, etc.). The final study (Chapter 6) aimed to identify the key performance indicators related to technical and tactical aspects by playing position (defender, midfielder and forward) and nationality in the CSL. Data were collected from 240 matches of CSL played by 16 teams in the 2016 season. Match performance data were gathered by OPTA Sports. Data from a total of total 2,364 observations included domestic (n=1,081) and foreign players (n=1,283). All comparisons were achieved by the nonclinical magnitude-based inferences (MBI). The analyses of technical-tactical performance variables (e.g. Attacking Challenges, Attacking Challenges Successful and Challenges/Won, etc.) showed significant differences between domestic and foreign players according to playing positions. This PhD thesis has b...